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General Description

Introduction

The Motorola MC68HC05P18 and MC68HC805P18 microcontrollers (MCU) are members of the M68HC05 Family with:

? 4-channel, 8-bit analog-to-digital (A/D) converter

? 16-bit timer with output compare and input capture

? Serial input/output port (SIOP)

? Computer operating properly (COP) watchdog timer

? 21 input/output (I/O) pins (20 bidirectional, one input-only)

Features

Features include:

? Low-cost M68HC05 core running at 2-MHz bus speed

? 28-pin dual in-line package (DIP) or small outline (SOIC) package

? 4-MHz on-chip crystal/ceramic resonator oscillator

? MC68HC05P18:

– 8064 bytes of user read-only memory (ROM)

– 48 bytes of page zero ROM

– 16 bytes of user vectors

? MC68HC805P18:

– 8064 bytes of user electrically erasable, programmable read-only memory (EEPROM)

– 48 bytes of page zero EEPROM

– 16 bytes of user vectors

? 192 bytes of on-chip random-access memory (RAM)

? 128 bytes of EEPROM

? Low-voltage reset (LVR)

? 4-channel, 8-bit A/D converter

? SIOP serial communications port

? COP watchdog timer with active pulldown on RESET

? 16-bit timer with output compare and input capture

? 20 bidirectional I/O lines and one input-only line

? High current sink and source on two I/O pins (PC0 and PC1)