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Introduction

The MC68H(R)C908JL3 is a member ofthe low-cost, high-performance M68HC08 Family of 8-bit microcontroller units(MCUs). The M68HC08 Family is based on the customer-specified integrated circuit (CSIC) design strategy. 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 MC68H(R)C908JL3 include the following:

? High-performance M68HC08 architecture

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

? Low-power design; fully static with stop and wait modes

? 5V and 3V operating voltages

? 8MHz internal bus operation

? RC-oscillator circuit or crystal-oscillator options

? In-system FLASH programming

? FLASH security1

? User FLASH memory

¨C 4096 bytes for MC68H(R)C908JL3/JK3

¨C 1536 bytes for MC68H(R)C908JK1

? 128 bytes of on-chip random-access memory (RAM)

? 2-channel, 16-bit timer interface module (TIM)

? 12-channel, 8-bit analog-to-digital converter (ADC)

? 23 general purpose I/O ports for MC68H(R)C908JL3:

¨C 7 keyboard interrupt with internal pull-up

¨C 10 LED drivers

¨C 2 ¡Á25mA open-drain I/O with pull-up

¨C 2 ICAP/OCAP/PWM

? 15 general purpose I/O ports for MC68H(R)C908JK3/JK1:

¨C 1 keyboard interrupt with internal pull-up(with RC oscillator option selected)

¨C 4 LED drivers

¨C 2 ¡Á25mA open-drain I/O with pull-up

¨C 2 ICAP/OCAP/PWM

? System protection features:

¨C Optional computer operating properly (COP) reset

¨C Optional low-voltage detection with reset and selectable trip

points for 3V and 5V operation.

¨C Illegal opcode detection with reset

¨C Illegal address detection with reset

? Master reset pin with internal pull-up and power-on reset

? IRQ1with programmable pull-up and schmitt-trigger input

? 28-pin PDIP and 28-pin SOICpackages for MC68H(R)C908JL3

? 20-pin PDIP and 20-pin SOIC packages for MC68H(R)C908JK3/JK1

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 ¡Á8 multiply instruction

? Fast 16/8 divide instruction

? Binary-coded decimal (BCD) instructions

? Optimization for controller applications

? Efficient C language support