MC68HC908GT16_07 Datasheet, PDF (21/292 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 1
General Description
1.1 Introduction
The MC68HC908GT16, MC68HC908GT8, and MC68HC08GT16 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.
This revision introduces the MC68HC08GT16, the ROM part equivalent to the MC68HC908GT16. The
entire data book applies to this ROM device, with the exceptions outlined in Appendix A MC68HC08GT16.
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)
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the Flash difficult for
unauthorized users.
MC68HC908GT16 • MC68HC908GT8 • MC68HC08GT16 Data Sheet, Rev. 5.0
Freescale Semiconductor
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