General Description

Introduction

The MC68HC908AP64A 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 of the MC68HC908AP64A include the following:

• High-performance M68HC08 architecture

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

• Maximum internal bus frequency:

   – 8-MHz at 5V operating voltage

• Clock input options:

   – RC-oscillator

   – 1- to 8-MHz crystal-oscillator with 32MHz internal PLL

• User program FLASH memory with security(1) feature

   – 62,368 bytes for MC68HC908AP64A

   – 32,768 bytes for MC68HC908AP32A

   – 16,384 bytes for MC68HC908AP16A

   – 8,192 bytes for MC68HC908AP8A

• On-chip RAM

   – 2,048 bytes for MC68HC908AP64A and MC68HC908AP32A

   – 1,024 bytes for MC68HC908AP16A and MC68HC908AP8A

• Two 16-bit, 2-channel timer interface modules (TIM1 and TIM2) with selectable input capture, output compare, and PWM capability on each channel

• Timebase module

• Serial communications interface module 1 (SCI)

• Serial communications interface module 2 (SCI) with infrared (IR) encoder/decoder

• Serial peripheral interface module (SPI)

• System management bus (SMBus), version 1.0/1.1 (multi-master IIC bus)

• 8-channel, 10-bit analog-to-digital converter (ADC)

• IRQ1 external interrupt pin with integrated pullup

• IRQ2 external interrupt pin with programmable pullup

• 8-bit keyboard wakeup port with integrated pullup

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

   – 31 shared-function I/O pins

   – 8 LED drivers (sink)

   – 6 × 25mA open-drain I/O with pullup

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

• Master reset pin (with integrated pullup) and power-on reset

• System protection features

   – Optional computer operating properly (COP) reset, driven by internal RC oscillator

   – Low-voltage detection with optional reset or interrupt

   – Illegal opcode detection with reset

   – Illegal address detection with reset

• 48-pin low quad flat pack (LQFP), 44-pin quad flat pack (QFP), and 42-pin shrink dual-in-line package (SDIP)

• Specific features of the MC68HC908AP64A in 42-pin SDIP are:

   – 30 general-purpose l/Os only

   – External interrupt on IRQ1 only

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