General Description

Introduction

The MC68HC908JL16 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.

特性 Features

Features include:

? 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

? Maximum internal bus frequency:

– 8-MHz at 5-V operating voltage

– 4-MHz at 3-V operating voltage

? Oscillator options:

– Crystal or resonator

– RC oscillator

? 16,384 bytes user program FLASH memory with security(1)

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

? Two 16-bit, 2-channel timer interface modules (TIM1 and TIM2) with selectable input capture, output compare, and pulse-width modulation (PWM) capability on each channel; external clock input option on TIM2

? 13-channel, 10-bit analog-to-digital converter with internal bandgap reference channel (ADC10)

? Serial communications interface module (SCI)

? Multi-master IIC module (MMIIC)

? Up to 26 general-purpose input/output (I/O) ports:

– 8 keyboard interrupt with internal pull up

– 11 LED drivers (sink)

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

– Inputs contain hysteresis buffer for improved noise immunity

? Resident routines for in-circuit programming and EEPROM emulation

? System protection features:

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

– Optional low-voltage detection with reset and selectable trip points for 3-V and 5-V operation

– Illegal opcode detection with reset

– Illegal address detection with reset

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

? IRQ with schmitt-trigger input and programmable pull up

? The MC68HC908JL16 is available in the following packages:

– 28-pin plastic dual in-line package (PDIP)

– 28-pin small outline integrated package (SOIC)

– 32-pin shrink dual in-line package (SDIP)

– 32-pin low-profile quad flat pack (LQFP)

? Specific features in 28-pin packages are:

– 23 general-purpose I/Os only

– 7 keyboard interrupt with internal pull up

– 10 light-emitting diode (LED) drivers (sink)

– 12-channel ADC

– Timer I/O pins on TIM1 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