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

  – 4096 bytes for MC68H(R)C908JL3/JK3

  – 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:

  – 7 keyboard interrupt with internal pull-up

  – 10 LED drivers

  – 2 ×25mA open-drain I/O with pull-up

  – 2 ICAP/OCAP/PWM

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

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

  – 4 LED drivers

  – 2 ×25mA open-drain I/O with pull-up

  – 2 ICAP/OCAP/PWM

• System protection features:

  – Optional computer operating properly (COP) reset

  – Optional low-voltage detection with reset and selectable trip

points for 3V and 5V operation.

  – Illegal opcode detection with reset

  – 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 ×8 multiply instruction

• Fast 16/8 divide instruction

• Binary-coded decimal (BCD) instructions

• Optimization for controller applications

• Efficient C language support