mc68hc908gr8a Freescale Semiconductor, Inc, mc68hc908gr8a Datasheet - Page 19

• Manufacturer Part Number: mc68hc908gr8a
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Chapter 1
General Description
1.1 Introduction
The MC68HC908GR8A 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.
This document also describes the MC68HC908GR4A. The MC68HC908GR4A is a device identical to the
MC68HC908GR8A except that it has less FLASH memory. Only when there are differences from the
MC68HC908GR8A is the MC68HC908GR4A specifically mentioned in the text.
1.2 Features
For convenience, features have been organized to reflect:
1.2.1 Standard Features
Features include:
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the FLASH difficult for
Freescale Semiconductor
unauthorized users.
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Standard features
Features of the CPU08
High-performance M68HC08 architecture optimized for C-compilers
Fully upward-compatible object code with M6805, M146805, and M68HC05 Families
8-MHz internal bus frequency
Clock generation module supporting 1-MHz to 8-MHz crystals
FLASH program memory security
On-chip programming firmware for use with host personal computer which does not require high
voltage for entry
In-system programming (ISP)
System protection features:
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Low-power design; fully static with stop and wait modes
Standard low-power modes of operation:
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Optional computer operating properly (COP) reset
Low-voltage detection with optional reset and selectable trip points for 3.0-V and 5.0-V
operation
Illegal opcode detection with reset
Illegal address detection with reset
Wait mode
Stop mode
MC68HC908GR8A • MC68HC908GR4A Data Sheet, Rev. 5
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