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General Description

The MC68HC(7)05H12 HCMOS microcomputer is a member of the

M68HC05 family. This 8 bit microcomputer unit (MCU) contains on-chip

oscillator, CPU, RAM, (EP)ROM, monitor ROM, EEPROM, parallel I/O,

one core timer, COP watchdog system, two 16-bit programmable timers,

synchronous and asynchronous serial interface, a 4 channel A/D

converter, and an 8 channel 8-bit PWM with on-chip power driver

circuitry.

Features

? HC05 core

? 52 PLCC package

? 12032 bytes of user (EP)ROM + 240 bytes of monitor ROM + 16

bytes user vectors

? 256 bytes of RAM

? 256 bytes of EEPROM

? Multipurpose core timer, real time interrupt (RTI), COP watchdog

timer

? Two 16-bit timers with two input captures and two output

compares each

? Serial peripheral interface (SPI)

? Serial communications interface (SCI)

? 4 channel A/D converter (8-bit resolution)

? Keyboard interrupt for 8 I/O lines

? 8 channel 8-bit PWM system for control of H-bridge drivers

? 12 special power drivers to drive two major gauges and four minor

gauges, with short circuit detection and slew rate limitation for

reduced RFI (EMC)

? Power saving WAIT mode

? 2 selectable bus frequencies (slow mode)

? Low voltage reset (LVR) circuitry to hold the CPU in reset