Overview; Description; M38813M4-Xxxhp Functions - Acer 390 Series Service Manual

2.5 M38813
2.5.1

Overview

The M38813M4-XXXHP is an 8-bit single-chip microcomputer created in a silicon gate CMOS
process. Built into this single-chip microcomputer are:
Serial l/O function (either clock synchronous or UART method selectable in software)
8-bit timers
8-bit Comparator
Double Bus interface
The M38813M4-XXXHP is designed as a dedicated microcomputer for Keyboard controller. The
reduced power dissipation of the CMOS process also makes this microcomputer extremely useful
for applications utilizing battery power.
2.5.2

Description

The functions of the M38813M4-XXXHP are outlined in Table1.1.1. In this manual, the suffix HP
indicates a 0.5mm-lead pitch QFP.
Table 2-9

M38813M4-XXXHP Functions

Parameter
Basic instructions
Instruction execution time
Oscillation frequency
Memory size
Input/output ports
Serial l/O
Timers
Comparator
Bus interface
Key on wake up
Interrupts
Clock generation circuit
Supply voltage
Power dissipation
Input/output characteristics
Major Chips Description
71
0.5 s (shortest instruction, at 8MHz oscillation frequency)
8MHz (max.)
ROM
RAM
P0-P4
P5
P6
Clock synchronous or asynchronous
8-bit prescaler x 2 and 8-bit timer x 3
4-bit resolution x 8 channels
Two 8-bit Master CPU bus interface
8 inputs
8 external, 9 internal, 1 software
Built-in (connect to external ceramic resonator or quartz crystal oscillator)
f(X )=8MHz
IN
f(X )=4MHz
IN
40mW (at 8MHz oscillation frequency, typ.)
Input/output break-down voltage
Function
16384 bytes of user area
512 bytes
8-bit X 5
4-bit X 1
2-bit X 1
4.0 to 5.5V
2.7 to 5.5V
5V
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