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.

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)

‧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