Datasheet

General Description

Technical Data MC68HC908LJ12 — Rev. 2.1

34 General Description Freescale Semiconductor

1.2 Introduction

The MC68HC908LJ12 is a member of the 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.

1.3 Features

Features of the MC68HC908LJ12 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

– 4-MHz at 3.3V operating voltage

• 32-kHz crystal oscillator clock input with 32MHz internal phase-

lock-loop

• Optional continuous crystal oscillator operation in stop mode

• 12k-bytes user program FLASH memory with security

feature

• 512 bytes of on-chip RAM

• Two 16-bit, 2-channel timer interface modules (TIM1 and TIM2)

with selectable input capture, output compare, and PWM

capability on each channel

• Real time clock (RTC) with clock, calendar, alarm, and

chronograph functions. Selectable periodic interrupt requests for

seconds, minutes, hours, days, 2-Hz, 4-Hz, and 100-Hz

• Serial communications interface module (SCI) with infrared (IR)

encoder/decoder

1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or

copying the FLASH difficult for unauthorized users.