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)