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MC68HC908GT16 MC68HC908GT8 Data Sheet, Rev. 3
Freescale Semiconductor
19
Chapter 1
General Description
1.1 Introduction
The MC68HC908GT16 and the MC68HC908GT8 are members 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.
All references to the MC68HC908GT16 in this data book apply equally to the MC68HC908GT8, unless
otherwise stated.
1.2 Features
For convenience, features have been organized to reflect:
Standard features of the MC68HC908GT16/MC68HC908GT8
Features of the CPU08
1.2.1 Standard Features of the MC68HC908GT16/MC68HC908GT8
High-performance M68HC08 architecture optimized for C-compilers
Fully upward-compatible object code with M6805, M146805, and M68HC05 Families
8-MHz internal bus frequency
Internal oscillator requiring no external components:
–
Software selectable bus frequencies
–
±25 percent accuracy with trim capability to ±4 percent
–
Clock monitor
–
Option to allow use of external clock source or external crystal/ceramic resonator
FLASH program memory security
(1)
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:
–
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
Low-power design; fully static with stop and wait modes
Standard low-power modes of operation:
–
Wait mode
–
Stop mode
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the FLASH difficult for
unauthorized users.