General Description

Introduction

The MC68HC908AS32A is a member of the low-cost, high-performance M68HC08 Family of 8-bit microcontroller units (MCUs). 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 include:

• High-performance M68HC08 architecture

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

• 8.4 MHz internal bus frequency

• 32,256 bytes of FLASH electrically erasable read-only memory (FLASH)

• FLASH data security(1)

• 512 bytes of on-chip electrically erasable programmable read-only memory with security option (EEPROM)(1)

• 1 Kbyte of on-chip RAM

• Clock generator module (CGM)

• Serial peripheral interface module (SPI)

• Serial communications interface module (SCI)

• 8-bit, 15-channel analog-to-digital converter (ADC)

• 16-bit, 6-channel timer interface module (TIM)

• Programmable interrupt timer (PIT)

• System protection features

– Computer operating properly (COP) with optional reset

– Low-voltage detection with optional reset

– Illegal opcode detection with optional reset

– Illegal address detection with optional reset

• Low-power design (fully static with stop and wait modes)

• Master reset pin and power-on reset

• SAE J1850 byte data link controller digital module

Features of the CPU08 include:

• 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

• C language support