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Nexcom Peak 555A User Manual

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Peak 555A
Single Board Computer
User's Guide
All brand names are registered trademarks of their owners.

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Summary of Contents for Nexcom Peak 555A

  • Page 1 Peak 555A Single Board Computer User′s Guide All brand names are registered trademarks of their owners.
  • Page 2 Trademarks Peak 555A is registered trademarks of Nexcom International Co., Ltd., IBM PC is a registered trademark of International Business Machines Corporation. Intel and Pentium are registered trademarks of Intel Corporation. Award is registered trademarks of Award Software, Inc.

  • Page 3: Table Of Contents

    Table of Contents How to Use This Guide Chapter 1. Introduction Specifications................… 1 . 2 W h a t y o u h a v e … … … … … … … … … … … … … … … … … … … . . 1 - 6 Chapter 2.
  • Page 4 Detection ..............4-33 Boot..............….4-37 4 . 1 3 B I O S R e f e r e n c e - P O S T M e s s a g e ..........… 4 - 3 8 4.14 BIOS Reference-POST Code ………………......…4-43 4 .

  • Page 5: Specifications

    How to use this guide This manual is written to help you use Peak 555A. The manual describes how to arrange various settings on the Pentium CPU board to meet your requirements. It‘s briefed as follows: Chapter 1, “Introduction” gives an overview of the product‘s specifications.

  • Page 6: Specifications

    Industrial workstation, and the controller in the computer telephony application. The PEAK 555A can run with Intel Pentium MMX processor up to 233 MHz, the brand new socket7 CPU like AMD K6-2 with 100MHz external clocks are also supported. The CPU support up to 400MHz very high performance, moreover, think to its advanced design, the Peak 555A also supports Intel low power CPU up to 266 MHz.
  • Page 7 Peak 555A User's Guide adapted AIC 7880, the Ultra wide SCSI module. It’s easy to design another module if necessary. Specifications...
  • Page 8 The Peak’s unique offering the ISAMAX is the standard feature of the Peak 555A, and supporting up to 20 PCs of ISA add-on cards without any problems A 4pin power connector is severed on the advanced power regular module for standalone application.
  • Page 9 Peak 555A User's Guide 1-1 Specifications • System architecture All socket 7 CPU supported, 66/100 MHz external clocks All in one with VGC/Panel, 100 Base TX, Ultra Wide SCSI PC’99 fully complied PCI V 2.2 complied PICMG 2.0 complied Half size SBC with ISA Gold finger •...

  • Page 10: Direction

    Peak 555A User's Guide • VGA 64 bit/100 MHz host Interface Shared memory 2MB, 4MB up to 8MB CRT & Panel support Max Res. Color Refresh rate 800 x 600 True color 85 Hz 1024 x 768 True color 85 Hz...
  • Page 11 Peak 555A User's Guide On Board 4 pin Power Connector for stand alone applications • On Board RTC High precision clock/calendar with battery back up • On Board solid state Disk Socket Socket reserved for M-systems’ DiskOnChip(DOC) Memory size up to 144MB single chip Drivers support DOS, Windows, Win 95 and NT(Bootable) •...
  • Page 12 • LAN driver diskette x 1 • Y cable for Keyboard and Mouse • SCSI driver diskette x 3 (for PEAK 555A only) • Wide SCSI Cable x 1 (for PEAK 555A only) If any of these items is missed or damaged, please contact your vendor for what you want.

  • Page 13: Jumpers And Connectors

    Peak 555A User's Guide Chapter 2 Jumpers and Connectors This chapter gives the definitions and shows where to locate the positions of jumpers and connectors. 2-1 Jumpers Jumper on the CPU board are used to select options for certain features.
  • Page 14 Peak 555A User's Guide SDFD1 Figure 2-2 Jumper Positions Jumper Setting Table (*: default setup) DISK ON Chip Disable Doc C8000 D0000 *OFF D8000 E0000 BIOS Refresh SW1.4 * ON Enabled Disabled Switches and Connectors...
  • Page 15 Peak 555A User's Guide CLOCK Frequency S2.1 S2.2 S2.3 S2.4 SDRAM 90.00 90.00 30.00 100.05 66.70 33.35 95.00 63.33 31.66 100.00 66.66 33.33 100.00 75.00 30.00 112.00 74.66 37.33 124.00 88.86 31.00 133.30 66.70 33.32 *OFF 66.70 66.70 33.35 75.00 75.00...
  • Page 16 Peak 555A User's Guide S1.6 Normal Clear CMOS Data S3 for Intel CPU Core/Bu S3.1 S3.2 S3.3 S3.4 S3.5 S3.6 S3.7 S3.8 s Ratio 1.5X 2.0X 2.5X 3.0X *OFF *OFF *OFF 3.5X 4.0X S3 for AMD CPU Core/Bu S3.1 S3.2 S3.3...
  • Page 17 Peak 555A User's Guide 2-2 Connectors Connectors on the CPU Board provide interfaces to other devices. Connector Function Remark Key Lock Connector Speaker Connector IDE1 Primary IDE Connector IDE2 Secondary IDE connector FDC Connector Printer Connector Com2 Connector 2 VGA 1...
  • Page 18 Peak 555A User's Guide Pin definitions of connectors • J10: Key lock PIN No. Description Ground Ground Key lock Ground • J4: Speaker PIN No. Description Speaker signal Ground Ground • JP2: Reset Switch PIN No. Description External Reset Ground...
  • Page 19 Peak 555A User's Guide • IDE1/IDE2: IDE Interface Connector Description Description Reset# Ground Data 7 Data 8 Data 6 Data 9 Data 5 Data 10 Data 4 Data 11 Data 3 Data 12 Data 2 Data 13 Data 1 Data 14...
  • Page 20 Peak 555A User's Guide • J13: FDC Connector Description Description Ground Density Select Ground Ground Ground Index# Ground Motor Enable Ground Drive Select Ground Drive Select Ground Motor Enable Ground Direction# Ground Step# Ground Write Data# Ground Write Gate# Ground...
  • Page 21 Peak 555A User's Guide Ground Ground Ground Ground Ground • J14: Serial Port Connector -D-Sub 9-Pin PIN No. Description Data Carrier Detect (DCD) Receive Data (RXD) Transmit Data (TXD) Data Terminal Ready (DTR) Ground (GND) Data Set Ready (DSR) Request to Send (RTS)
  • Page 22 Peak 555A User's Guide SBD0+ Ground • PS2: 6-Pin Mini-DIN Keyboard Connector (PS/2 Type) PIN No. Description Keyboard Data Mouse/Data Ground Keyboard Clock Mouse/Data • J12: Keyboard Connector PIN No. Description Keyboard Clock Keyboard Data Ground • JP1: IDE LED Connector PIN No.
  • Page 23 Peak 555A User's Guide • Mini PCI Connector Data 0 Data 1 Data 2 Data 3 Data 4 Data 5 Data 6 Data 7 Ground Data 8 Data 9 Data 10 Data 11 Data 12 Data 13 Data 14 Data 15...
  • Page 24 Peak 555A User's Guide J2: IR Pin No. Description IRRXH (FAST IR) IRRX IRTX J2 FAN J2 FAN J4 Power J4 Power Connector Connector Figure 2-3 Power Module 2-12 Switches and Connectors...
  • Page 25 Peak 555A User's Guide Vcore Voltage S1.1 S1.2 S1. 3 S1.4 S1.5 S1.6 1.9V 2.2V *2.8V *OFF *OFF *OFF *OFF *OFF 2.9V 3.2V 3.3V .45V V I/O S1.7 *3.3V *OFF 3.45V CPU VIO S1.8 S1.9 3.45V *3.3V *OFF 2.5V Standby Power S1.10...
  • Page 26 Peak 555A User's Guide AIC-78809 SCSI 68 Pin Connector Figure 2-4 SCSI Connector SW1.1 SCSI Terminator SW1.2 8/16Bit SCSI Enabled Disabled 2-14 Switches and Connectors...
  • Page 27 Peak 555A User's Guide • JP3 ATX Power Bottom Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground TRMPWR TRMPWR Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground...

  • Page 28: Chapter 3. Capability Expanding

    Peak 555A User's Guide Chapter 3 Capability Expanding This chapter explains how you can expand capability of your CPU board in such aspects as system memory, cache memory, and CPU. 3-1 System Memory Your system DRAM is provided by 168 pin DIMM's (Dual In-line Memory Modules) on the CPU board.
  • Page 29 Peak 555A User's Guide The DIMM used SDRAM memory. Please be noted that if the 100MHz CPU external lock is turned on, the memory should be SDRAM only and PC-100 complied. DIMM (Bank 1) DIMM (Bank 0) Figure 3-2 Memory Banks...

  • Page 30: C A C H E Memory

    The default L2 Cache is 512 KB. 3.3 Change CPU The Peak 555A uses the 321 pin PGA socket rather than the ZIF socket, so it needs force to push or pull the CPU into or out from the socket.

  • Page 31: Chapter 4. Award Bios Setup

    Peak 555A User’s Guide Chapter 4 AWARD BIOS Setup Award's BIOS ROM has a built-in Setup program that allows users to modify the basic system configuration. This type of information is stored in battery-backed RAM (CMOS RAM) so that it retains the Setup information when the power is turned off.

  • Page 32: Control Keys

    Peak 555A User’s Guide Control Keys Up arrow Move to previous item Down arrow Move to next item Left arrow Move to the item in the left hand Right arrow Move to the item in the right hand Esc key...

  • Page 33: Getting Help

    Peak 555A User’s Guide Getting Help Main Menu The on-line description of the highlighted setup function is displayed at the bottom of the screen. Status Page Setup Menu/Option Page Setup Menu Press F1 to pop up a small help window that describes the appropriate keys to use and the possible selections for the highlighted item.

  • Page 34: The Main Menu

    Peak 555A User’s Guide The Main Menu Once you enter Award BIOS CMOS Setup Utility, the Main Menu (Figure 1) will appear on the screen. The Main Menu allows you to select from ten setup functions and two exit choices. Use arrow keys to select among the items and press <Enter>...

  • Page 35: Chipset Features Setup

    Peak 555A User’s Guide Chipset features setup This setup page includes all the items of chipset special features. See Page 4-17 to Page 4-21 for details. Power Management setup This category determines how much power consumption for system after selecting below items. Default value is Disable. See Page 4-22 to Page 4-26 for details.
  • Page 36 Peak 555A User’s Guide IDE HDD auto detection Automatically configure hard disk parameters. See Page 4-34. Save & Exit Setup Save CMOS value changes to CMOS and exit setup. Exit without saving Abandon all CMOS value changes and exit setup.

  • Page 37: Standard Cmos Setup Menu

    Peak 555A User’s Guide Standard CMOS Setup Menu The items in Standard CMOS Setup Menu are divided into 10 categories. Each category includes no, one or more than one setup items. Use the arrow keys to highlight the item and then use the <PgUp> or <PgDn> keys to select the value you want in each item.
  • Page 38 Peak 555A User’s Guide month The month, Jan through Dec year The year, depend on the year of BIOS Time The time format is <hour> <minute> <second>. which accepts both function key or numerical key The time is calculated based on the 24-hour military-time clock.

  • Page 39: Setup

    Peak 555A User’s Guide Drive A type/Drive B type The category identifies the types of floppy disk drive A or drive B that have been installed in the computer. None No floppy drive installed 360K, 5.25 in 5-1/4 inch PC-type standard drive; 360 kilobyte capacity 1.2M, 5.25 in...
  • Page 40 Peak 555A User’s Guide Error halt The category determines whether the computer will stop if an error is detected during power up. No errors Whenever the BIOS detects a non-fatal error the system will be stopped and you will be prompted.

  • Page 41: Bio Feature Setup

    Peak 555A User’s Guide BIOS Features Setup Menu Virus Warning This category flashes on the screen. During and after the system boots up, any attempt to write to the boot sector or partition table of the hard disk drive will halt the system and the following error message will appear, in the mean time, you can run an anti-virus program to locate the problem.

  • Page 42: Track.

    Peak 555A User’s Guide ote: This function is available only for DOS and other OSes that do not trap INT13. CPU Internal Cache/External Cache These two categories speed up memory access. However, it depends on CPU/chipset design. The default value is Enable. If your CPU without Internal Cache then this item “CPU Internal Cache”...

  • Page 43: Boot Up Numlock Status

    Peak 555A User’s Guide Disabled BIOS will not search for the type of floppy disk drive by track number. Note that there will not be any warning message if the drive installed is 360K. Boot Up NumLock Status The default value is On.

  • Page 44: Setup

    Peak 555A User’s Guide Security Option This category allows you to limit access to the system and Setup, or just to Setup. System The system will not boot and access to Setup will be denied if the correct password is not entered at the prompt.
  • Page 45 Peak 555A User’s Guide Enabled Video shadow is enabled Disabled Video shadow is disabled BIOS Setup...
  • Page 46 Peak 555A User’s Guide C8000 - CFFFF Shadow/D8000 - DFFFF Shadow These categories determine whether optional ROM will be copied to RAM by 16K byte or 32K byte per/unit and the size depends on chipset. Enabled Optional shadow is enabled...

  • Page 47: Chipset Features Setup Menu

    Peak 555A User’s Guide Chipset Features Setup Menu Since the features in this section are related to the chipset in the CPU board and all are optimized, you are not recommended to change the default settings in the setup table, unless you know very detailed of the chipset features.

  • Page 48: Data.

    Peak 555A User’s Guide Auto Configuration Auto Configuration selects predetermined optimal values of chipset parameters. When Disabled, chipset parameters revert to setup information stored in CMOS. Many fields in this screen are not available when Auto Configuration is Enabled. The Choice: Enabled (Default), Disabled.
  • Page 49 Peak 555A User’s Guide Fast EDO Lead Off The item allows you to select the Fast EDO Lead Off or not to enhance the performance. The Choice: Enabled, Disabled (Default). Refresh RAS# Assertion This item allows you to select the type of DRAM refresh clock delay.

  • Page 50: Data

    Peak 555A User’s Guide SDRAM (CAS Lat/RAS-to-CAS) This item allows you to select the CAS# latency for all SDRAM cycles and RAS# to CAS# delay. The timing type. 3/3 (Default) The timing type. SDRAM Speculative Read This item is capable of allowing a DRAM read request to be generated slightly before the address has been fully decoded.
  • Page 51 Peak 555A User’s Guide 8 Bit I/O Recovery Time The recovery time is the length of time, measured in CPU clocks, which the system will delay after the completion of an input/output request. This delay takes place because the CPU is operationg so much faster than the input/output bus that the CPU must be delayed to allow for the completion of the I/O.
  • Page 52 Peak 555A User’s Guide BIOS Setup...

  • Page 53: Power Management

    Peak 555A User’s Guide Power Management Setup The Power management setup will appear on your screen like this: Power Management This category determines how much power consumption for system after selecting below items. Default value is Disable. The following pages tell you the options of each item &...
  • Page 54 Peak 555A User’s Guide Item Options Descriptions A.Power Management 1. Disable Global Power Management will be disabled 2. User Define Users can configure their own power management 3. Min Saving Pre-defined timer values are used such that all timers are in their MAX value 4.
  • Page 55 Peak 555A User’s Guide 1. Break The External Suspend Switch is “Break” . Switch Function 2. Wake The External Suspend Switch is “Wake” 2. 1 Min Defines the continuous idle time before the 2 Min system entering DOZE mode. 4 Min 6 Min if any item defined in (J) is enabled &...
  • Page 56 Peak 555A User’s Guide H. Doze 1. Disable System will never enter STANDBY mode (*) Remark 1 2. 1 Min Defines the continuous idle time before the 2 Min system entering STANDBY mode. 4 Min 6 Min if any item defined in (J) is enabled & active,...
  • Page 57 Peak 555A User’s Guide K. VGA Activity 1. Disabled IRQ3 (COM 2) 2. Enabled IRQ4 (COM 1) IRQ5 (LPT 2) IRQ6 (Floppy Disk) IRQ7 (LPT 1) IRQ8 (RTC Alarm) IRQ9 (IRQ2 Redir) IRQ10 (Reserved) IRQ11 (Reserved) IRQ12 (PS/2 Mouse) IRQ13 (Coprocessor)

  • Page 58: Data

    Peak 555A User’s Guide PnP/PCI Configuration This section describes configuring the PCI bus system. PCI, or Peripheral Component Interconnect, is a system which allows I/O devices to operate at speeds nearing the speed the CPU itself uses when communicating with its own special components. This section...

  • Page 59: Data

    Peak 555A User’s Guide Resource Controlled by The Award Plug and Play BIOS has the capacity to automatically configure all of the boot and Plug and Play compatible devices. However, this capability means absolutely nothing unless you are using a Plug and ®...

  • Page 60: S Y S T E M E N V I R O N M E N

    Peak 555A User’s Guide System Environment ROM PCI / ISA BIOS (Peak-555) SYSTEM ENVIRONMENT AWARD SOFTWARE, INC. Current CPU Temperature Current CPU FAN Speed : DRPM In 0(v) : 5.08V In 2(v) : 2.80V ↑ ↓ → ←: Select Item...

  • Page 61: I N T E G R A T E D P E R I P H E R A L

    Peak 555A User’s Guide Integrated Peripherals ROM PCI / ISA BIOS (Peak-555) INTEGRATED PERIPHERALS AWARD SOFTWARE, INC. Internal PCI/IDE : Both IDE Primary Master PIO : Auto IDE Primary Slave PIO : Auto IDE Secondary Master : Auto Onboard Parallel Port...
  • Page 62 Peak 555A User’s Guide The four IDE PIO (Programmed Input/Output) fields let you set a PIO mode (0-4) for each of the four IDE devices that the onboard IDE interface supports. Modes 0 through 4 provide successively increased performance. In Auto mode, the system automatically determines the best mode for each device.
  • Page 63 Peak 555A User’s Guide This item allows you to determine which Infra Red (IR) function of onboard I/O chip. The Choice: Standard , IrDA1.0, ASK-IR, (Default) IrDA1.1 Duplex Select This item allows you to select the IR function when your select the UART 2 Mode is IrDA1.0, ASK-IR, IrDA1.1...

  • Page 64: Supervisor/User Password Setting

    Peak 555A User’s Guide Supervisor/User Password Setting You can set either supervisor or user password, or both of then. The differences between are: supervisor password : can enter and change the options of the setup menus. user password : just can enter but do not have the right to change the options of the setup menus.

  • Page 65: Detection

    Peak 555A User’s Guide IDE HDD Auto Detection The Enhance IDE features was included in all Award BIOS. Below is a brief description of this feature. 1. Setup Changes <I> Auto-detection BIOS setup will display all possible modes that supported by the including NORMAL, LBA &...
  • Page 66 Peak 555A User’s Guide Secondary None Master: Secondary Slave None When HDD type is in ‘user’ type, the “MODE” option will be opened for user to select their own HDD mode. (2) HDD Modes The Award BIOS supports 3 HDD modes : NORMAL, LBA & LARGE...
  • Page 67 Peak 555A User’s Guide The maximum HDD size supported by LBA mode is 8.4 Gigabytes which is obtained by the following formula: no. Cyclinder ( 1024) x no. Head ( 255) x no. Sector x bytes per sector ( 512) 8.4 Gigabytes...
  • Page 68 Peak 555A User’s Guide (3) Remarks To support LBA or LARGE mode of HDDs, there must be some softwares involved. All these softwares are located in the Award HDD Service Routine(INT 13h). It may be failed to access a HDD with LBA (LARGE) mode selected if you are...

  • Page 69: O W E R O N Boot

    Peak 555A User’s Guide Power-On Boot After you have made all the changes to CMOS values and the system cannot boot with the CMOS values selected in Setup, restart the system by turning it OFF then ON or Pressing the "RESET" button on the system case. You may also restart by simultaneously press <Ctrl>, <Alt>, and <Delete>...

  • Page 70: Initialize

    Peak 555A User’s Guide BIOS Reference - POST Message During the Power On Self Test (POST), if the BIOS detects an error requiring you to do something to fix, it will either sound a beep code or display a message.

  • Page 71: Ground

    Peak 555A User’s Guide DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER No boot device was found. This could mean that either a boot drive was not detected or the drive does not contain proper system boot files. Insert a system disk into Drive A: and press <Enter>.

  • Page 72: Ground

    Peak 555A User’s Guide ERROR ENCOUNTERED INITIALIZING HARD DRIVE Hard drive cannot be initialized. Be sure the adapter is installed correctly and all cables are correctly and firmly attached. Also be sure the correct hard drive type is selected in Setup.
  • Page 73 Peak 555A User’s Guide Memory parity Error at ... Indicates a memory parity error at a specific location. You can use this location along with the memory map for your system to find and replace the bad memory chips. MEMORY SIZE HAS CHANGED SINCE LAST BOOT Memory has been added or removed since the last boot.
  • Page 74 Peak 555A User’s Guide RAM PARITY ERROR - CHECKING FOR SEGMENT ... Indicates a parity error in Random Access Memory. Should Be Empty But EISA Board Found PLEASE RUN EISA CONFIGURATION UTILITY A valid board ID was found in a slot that was configurated as having no board ID.

  • Page 75: Bios Reference-Post Code

    Peak 555A User’s Guide NOTE: When this error appears, the system will boot in ISA mode, which allows you to run the EISA Configuration Utility. BIOS Reference - POST Codes Note: EISA POST codes are typically output to port address 300h.
  • Page 76 Peak 555A User’s Guide This POST code is for boot block POST Description (hex) 1. Turn off OEM specific cache, shadow... 2. Initialize all the standard devices with default values standard devices includes: -DMA controller (8237) -Programmable Interrupt Controller (8259)
  • Page 77 Peak 555A User’s Guide This page is for Non-Compressed Version only 01-0 Reserved Turn off OEM specific cache, shadow... 1. Initialize EISA registers (EISA BIOS only) 2. Initialize all the standard devices with default values Standard devices includes: -DMA controller (8237)
  • Page 78 Peak 555A User’s Guide The following POST Codes are for all of Compress Version & Non-Compress Version POST Description (hex) 1. Verify the RTC time is valid or not 2. Detect bad battery 3. Read CMOS data into BIOS stack area 4.
  • Page 79 Peak 555A User’s Guide 1. Test Base Memory from 256K to 640K 2. Test Extended Memory from 1M to the top of memory BIOS Setup...
  • Page 80 Peak 555A User’s Guide 1. Display the Award Plug & Play BIOS Extension message (PnP BIOS only) 2. Program all onboard super I/O chips (if any) including COM ports, LPT ports, FDD port... according to setup value 33-3B Reserved Set flag to allow users to enter CMOS Setup Utility 1.
  • Page 81 Peak 555A User’s Guide POST(hex) Description Try to turn on Level 2 cache Note: Some chipset may need to turn on the L2 cache in this stage. But usually, the cache is turn on later in POST Try to turn on Level 2 cache Note: Some chipset may need to turn on the L2 cache in this stage.

  • Page 82: I O S D E F A U L T D R I V E T A B L E

    Peak 555A User’s Guide BIOS Default Drive Table This is a current list of the drive type table contained in Setup. Type Size Cylinders Heads Sector Write Land Example (MB) Precomp Zone Model TEAC SD510, MMI 112, 5412 Seagate ST225,...
  • Page 83 Peak 555A User’s Guide Seagate ST4038 BIOS Setup...
  • Page 84 Peak 555A User’s Guide 1024 None Seagate ST4051 1224 None 1023 Seagate ST4096 1224 None 1223 Maxtor 2085 1224 None 1223 Maxtor 2140, Priam S14 1024 None 1223 Maxtor 2190, Priam S19 1024 None 1023 Maxtor 1085, Micropolis 1325 None...
  • Page 85 Peak 555A User’s Guide User BIOS Setup...

  • Page 86: Appendix 1 Watch Dog Timer

    Peak 555A User’s Guide Appendix Watch Dog Timer Set up menu: refer to Page 4-24, “Integrated Peripherals” WDT Configuration port Default at F2 Watch Dog Timer Disabled 1. Default at disabled Enabled 2. Enabled for user′s programming WDT Time out active for Reset...
  • Page 87 Peak 555A User’s Guide Port Used Default at F2 Bit definitions of F2 D4: 1 select NMI select Reset D3: 1 Enable watch dog timer Disable watch dog timer < D2, D1, D0>: 111 : 110 : Select 1 second...
  • Page 88 Peak 555A User’s Guide • Initialize the SQW of RTC, set SQW output period=0.5 second Out port 70 = 0A Out port 71 = 2F ( generate SQW = 0.5 Sec.) Out port 70 = 0B Out port 71 = 0A ( enable the SQW output) •...
  • Page 89 Peak 555A User’s Guide An Example a. Enable watchdog timer b. Select I/O port F2 & set WDT timer at 1 sec interval c. Select NMI d. Enable WDT e. Clear WDT f. Disable WDT Set RTC to generate WDT timer source “SQW” to generate 0.5 sec.
  • Page 90 Peak 555A User’s Guide Select WDT timer setting (use port F2) AL, 06 ; Setting WDT=1 sec. DX, 0F2 DX, AL Select WDT for NMI or reset (select NMI) DX, 70 AL, 7D DX, AL DX, 71 AL, DX AL, 10...
  • Page 91 Peak 555A User’s Guide Clear WDT (this operation should be repeatedly executed before WDT time out, e.g. if WDT time out set at 16 sec., then to clear WDT, the instruction should be executed within 16 sec. repeatedly) DX, 0F2...

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