KING BILLION ELECTRONICS CO. LTD
HE89A20
HE80000 SERIES
1
V3.1E
A. HE89A20 Introduction
HE89A20 is a member of 8-bit Micro-controller series used for telephone communication developed by
King Billion Electronics Ltd. The built-in DTMF generator can generate the PSTN dialing tone directly.
It can be applicable as Small/ Medium class telephone or communication product etc..
The instruction set of HE89A20 are quite easy to learn and simple to use. Only about thirty instructions
with four-type addressing mode are provided. Most of instructions take only 3 oscillator clocks (machine
cycles). The processing power is enough to most of battery operation system.
B. HE89A20 Features
Operation Voltage
2.4V 5.5V
System Clock
DC ~ 8MHz @ 5.0V
DC
~
4MHz
@
2.4V
Internal ROM
16K Bytes(16K Program ROM)
Internal RAM 512
Bytes.
Dual Clock System
Normal (Fast) clock 32.768K ~ 8MHz
Slow
clock
32.768KHz
Operation Mode
DUALFASTSLOWIDLESLEEP Mode.
With WDT (WATCH DOG TIMER) to prevent deadlock condition..
32 bit Bi-directional I/O port. Mask Option can select PUSH-PULL or OPEN DRAIN output mode
for each I/O pin.
Built-in DTMF Generator.
Two external interrupts and three internal timer interrupts.
Two 16-bit timers and one Time Base timer.
Instruction set 32 instructions, 4 addressing mode. 9-bit DATA POINTER for RAM and 14-bit
TABLE
POINTER
for ROM.
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