General Description

Introduction

The MC68HC908AB32 is a member of the low-cost, high-performance M68HC08 Family of 8-bit microcontroller units (MCUs) with embedded EEPROM for user data storage. All MCUs in the family use the enhanced M68HC08 central processor unit (CPU08) and are available with a variety of modules, memory sizes and types, and package types.

Features

Features of the MC68HC908AB32 include the following:

• High-performance M68HC08 architecture

• Fully upward-compatible object code with M6805, M146805, and M68HC05 Families

• Memory map and pin functions compatible with MC68HC08AB32 and MC68HC08AB16

• 8-MHz internal bus frequency

• 32K-bytes user program FLASH memory with security1 feature

• 512 bytes of on-chip EEPROM with security feature

• 1K-byte of on-chip RAM

• Clock generator module (CGM)

• Two 16-bit, 4-channel timer interface modules (TIMA and TIMB)

with selectable input capture, output compare, and PWM

capability on each channel

• Programmable interrupt timer (PIT)

• Serial peripheral interface module (SPI)

• Serial communications interface module (SCI)

• 8-channel. 8-bit analog-to-digital converter (ADC)

• Low-power design (fully static with STOP and WAIT modes)

• Master reset pin and power-on reset

• 51 general-purpose input/output (I/O) pins:

– 30 shared-function I/O pins

– 5-bit keyboard wakeup port

– Selectable pullups on inputs on port D and port F

• System protection features

– Optional computer operating properly (COP) reset

– Low-voltage detection with optional reset

– Illegal opcode detection with optional reset

– Illegal address detection with optional reset

• 64-pin quad flat pack (QFP)

Features of the CPU08 include the following:

• Enhanced HC05 programming model

• Extensive loop control functions

• 16 addressing modes (eight more than the HC05)

• 16-bit Index register and stack pointer

• Memory-to-memory data transfers

• Fast 8 × 8 multiply instruction

• Fast 16/8 divide instruction

• Binary-coded decimal (BCD) instructions

• Optimization for controller applications

• Efficient C language support