Dallas DS5000(T) Manual

www.maxim-ic.com
FEATURES
8-Bit 8051-Compatible Microcontroller
Adapts to Task at Hand
8 or 32 kbytes of Nonvolatile RAM for
Program and/or Data Memory Storage
Initial Downloading of Software in End
System via On-Chip Serial Port
Capable of Modifying Its Own Program
and/or Data Memory in End Use
Crashproof Operation
Maintains All Nonvolatile Resources for 10
Years in the Absence of V
Temperature
Power-Fail Reset
Early Warning Power-Fail Interrupt
Watchdog Timer
Software Security Feature
Executes Encrypted Software to Prevent
Unauthorized Disclosure
On-Chip, Full-Duplex Serial I/O Ports
Two On-Chip Timer/Event Counters
32 Parallel I/O Lines
Compatible with Industry Standard 8051
Instruction Set and Pinout
Optional Permanently Powered Real-Time
Clock (DS5000T)
DESCRIPTION
The DS5000(T) Soft Microcontroller Module is a fully 8051-compatible 8-bit CMOS microcontroller that
offers "softness" in all aspects of its application. This is accomplished through the comprehensive use of
nonvolatile technology to preserve all information in the absence of system V
program/data memory space is implemented using either 8 or 32 kbytes of nonvolatile CMOS SRAM.
Furthermore, internal data registers and key configuration registers are also nonvolatile. An optional real-
time clock (RTC) gives permanently powered timekeeping. The clock keeps time to a hundredth of a
second using an on-board crystal.
Note: This data sheet provides ordering information, pinout, and electrical specifications. Refer to the
Secure Microcontroller User's Guide
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
at Room
CC
for operating information.
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Soft Microcontroller Module
PIN ASSIGNMENT
P1.0 1
P1.1 2
DS5000(T)
P1.2 3
P1.3 4
P1.4 5
P1.5 6
P1.6 7
P1.7 8
RST 9
RXD P3.0 10
TXD P3.1 11
INT0 P3.2 12
INT1 P3.3 13
T0 P3.4 14
T1 P3.5 15
WR P3.6 16
RD P3.7 17
XTAL2 18
XTAL1 19
GND 20
40-Pin Encapsulated Package
DS5000(T)
40 V
CC
39 P0.0 AD0
38 P0.1 AD1
37 P0.2 AD2
36 P0.3 AD3
35 P0.4 AD4
34 P0.5 AD5
33 P0.6 AD6
32 P0.7 AD7
31 EA
30 ALE
29 PSEN
28 P2.7 A15
27 P2.6 A14
26 P2.5 A13
25 P2.4 A12
24 P2.3 A11
23 P2.2 A10
22 P2.1 A9
21 P2.0 A8
. The internal
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REV: 070706