MC68HC908JW32_09 Datasheet, PDF (17/232 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Chapter 1
General Description
1.1 Introduction
The MC68HC908JW32 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.
1.2 Features
Features of the MC68HC908JW32 include:
• High-performance M68HC08 architecture
• Fully upward-compatible object code with M6805, M146805, and M68HC05 Families
• 8-MHz internal bus frequency
• 88-kHz internal RC clock for timebase wakeup
• 32-Kbytes of on-chip FLASH memory with security⁽¹⁾
• 1-Kbytes of on-chip random-access memory (RAM)
• On-chip programming firmware for use with host PC computer
• Clock generation module (CGM)
• Up to 34 general-purpose 5V input/output (I/O) pins, including:
– Keyboard interrupts on 8 pins
– Direct drive for normal LED on 8 pins
– High current drive for PS/2 connection on 2 pins (with USB module disabled)
• Serial peripheral interface module (SPI)
• PS2 clock generator module
• 16-bit, 2-channel timer interface module (TIM) with selectable rising and falling edges input
capture, output compare, PWM capability on each channel, and external clock input option
• Full universal serial bus (USB) specification 2.0 full-speed functions:
– 12 Mbps data rate
– On-chip 3.3V regulator
– Endpoint 0 with 8-byte transmit buffer and 8-byte receive buffer
– 64 bytes endpoint buffer to share among endpoints 1–4
• System protection features:
– Optional computer operating properly (COP) reset
– Optional low-voltage detection with reset
– Illegal opcode detection with reset
– Illegal address detection with reset
• Low-power design (fully static with stop and wait modes)
• Master reset pin with internal pull-up and power-on reset
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the FLASH/ROM
difficult for unauthorized users.
MC68HC908JW32 Data Sheet, Rev. 6
Freescale Semiconductor
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