General Description

1.1 Introduction

The MC68HC908AP64 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.

1.2 Features

Features of the MC68HC908AP64 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 or 3V operating voltage

• Clock input options:

– RC-oscillator

– 32-kHz crystal-oscillator with 32MHz internal PLL

• User program FLASH memory with security

– 62,368 bytes for MC68HC908AP64

– 32,768 bytes for MC68HC908AP32

– 16,384 bytes for MC68HC908AP16

– 8,192 bytes for MC68HC908AP8

• On-chip RAM

– 2,048 bytes for MC68HC908AP64 and MC68HC908AP32

– 1,024 bytes for MC68HC908AP16 and MC68HC908AP8

• 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 MC68HC908AP64 in 42-pin SDIP are:

– 30 general-purpose l/Os only

– External interrupt onIRQ1 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