Datasheet

General Description
Data Sheet MC68HC908LJ24/LK24 — Rev. 2.1
38 General Description Freescale Semiconductor
1.2 Introduction
The MC68HC908LJ24 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 MC68HC908LJ24 include the following:
• High-performance M68HC08 architecture
• Fully upward-compatible object code with M6805, M146805, and
M68HC05 Families
– 8-MHz at 5V operating voltage
– 4-MHz at 3.3V operating voltage
• 32.768kHz crystal oscillator clock input with 32MHz internal PLL
• Optional continuous crystal oscillator operation in stop mode
• 24K-bytes user program FLASH memory with security
1
feature
• 768 bytes of on-chip RAM
• Up to 48 general-purpose input/output (I/O) pins:
– High current 15mA sink capability on 30 pins
• Two 16-bit, 2-channel timer interface modules (TIM1 and TIM2)
with selectable input capture, output compare, PWM capability on
each channel, and external clock input option (T1CLK and T2CLK)
• Real time clock (RTC) with:
– Clock, calendar, alarm, and chronograph functions
– Selectable periodic interrupt requests for seconds, minutes,
hours, days, 2-Hz, 4-Hz, 8-Hz, 16-Hz, and 128-Hz
1. No security feature is absolutely secure. However, Freescale strategy is to make reading or
copying the FLASH difficult for unauthorized users.