EM78P568

8-bit OTP Micro-controller

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* This specification are subject to be changed without notice.

1

01/31/2004

V4.7

I. General Description

The EM78P568 is an 8-bit RISC type microprocessor with low power, high speed CMOS technology. There are

16Kx13 bits Electrical One Time Programmable Read Only Memory (OTP-ROM) within it. It provides security bits and

some One time programmable Option bits to protect the OTP memory code from any external access as well as to meet

user’s options.

This integrated single chip has an on_chip watchdog timer (WDT), program OTP-ROM, data RAM, LCD driver,

programmable real time clock/counter, internal interrupt, power down mode, 8-bit D/A, 5-bit Comparator, DAC tone

generator, CTCSS analog circuit, programming dual tone generator and tri-state I/O.

II. Feature

CPU

•Operating voltage : 2.2V∼5.5V

•16k x 13 on chip Electrical One Time Programmable Read Only Memory (OTP-ROM)

•1k x 8 on chip data RAM

•Up to 51 bi-directional tri-state I/O ports

•16 level stack for subroutine nesting

•8-bit real time clock/counter (TCC)

•two 8-bit counters : COUNTER1 and COUNTER2

•On-chip watchdog timer (WDT)

•99.9％ single instruction cycle commands

•Four modes (Main clock can be programmed from 447.829k to 17.913MHz generated by internal PLL)

Mode

CPU status

Main clock

32.768kHz clock status

Sleep mode

Turn off

Turn off

Turn off

Idle mode

Turn off

Turn off

Turn on

Green mode

Turn on

Turn off

Turn on

Normal mode

Turn on

Turn on

Turn on

•Input port interrupt function

•8 interrupt source, 4 external, 8 internal

•Dual clocks operation (Internal PLL main clock , External 32.768KHz)

PROGRAMMING TONE GENERATORS

•Operating voltage : 2.2V∼5.5V

•Programming Tone1 and Tone2 dual tone generators

•11-bit programming Tone1 generators

•8-bit programming Tone2 generator

COMPARATOR

•Operating : 2.7V ~ 5.5V

•3-channel input

•5-bit comparison reference level setting

•Internal (2.5V or VDD) or external reference level

DAC

•Operating : 2.7V∼5.5V

•8-bit R-2R D/A converter

•8-bit programmable tone output

•Easy to direct access as programmable CTCSS tone output by DAC tone generator

•Internal (VDD or 2.5V) reference