MC68HC908LB8_05 Datasheet, PDF (17/234 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Chapter 1
General Description
1.1 Introduction
The MC68HC908LB8 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, memory types, and package types.
The MC68HC908LB8 has peripherals dedicated to high resolution PWM and power factor correction
(PFC).
1.2 Features
For convenience, features have been organized to reflect:
• Standard features of the MC68HC908LB8
• Features of the CPU08
1.2.1 Standard Features of the MC68HC908LB8
Features of the MC68HC908LB8 include:
• 8-MHz internal bus frequency
• Trimmable internal oscillator:
– 4.0 MHz internal bus operation
– 8-bit trim capability
– 25% untrimmed
– 5% trimmed
• 8 Kbytes of 10 K write/erase cycle typical on-chip in application programmable FLASH memory
with security option⁽¹⁾
• 128 bytes of on-chip random-access memory (RAM)
• Dual channel high resolution PWM with dead time insertion and shutdown input. The outputs use
frequency dithering to achieve a 4 ns output resolution.
• Dual channel pulse-width modulator (PWM) module to provide power factor correction capability
• Seven channel, 8-bit successive approximation analog-to-digital converter (ADC)
• Op amp/comparator for power factor correction capability or general purpose use
• 7-bit keyboard interrupt
• One 16-bit, 2-channel timer interface module with one output available on port pin (PTA6) for input
capture and PWM
• 17 general-purpose input/output (I/O) pins and one input only pin
– Three shared with high resolution PWM (HRP)
– Three shared with PWM module
1. No security feature is absolutely secure. However, Freescale Semiconductor’s strategy is to make reading or copying the
FLASH difficult for unauthorized users.
MC68HC908LB8 Data Sheet, Rev. 1
Freescale Semiconductor
17