Datasheet

MC68HC908GZ16 • MC68HC908GZ8 Data Sheet, Rev. 4
Freescale Semiconductor 19
Chapter 1
General Description
1.1 Introduction
The MC68HC908GZ16 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.
0.
The information contained in this document pertains to both the MC68HC908GZ16 and the
MC68HC908GZ8 with the exceptions shown Appendix A MC68HC908GZ8
1.2 Features
For convenience, features have been organized to reflect:
• Standard features
• Features of the CPU08
1.2.1 Standard Features
Features include:
• 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
• MSCAN08 (implementing 2.0b protocol as defined in BOSCH specification dated September 1991)
• 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)
Table 1-1. Summary of Device Variations
Device Memory Size
MC68HC908QZ16 16 Kbytes user FLASH
MC68HC908GZ8 8 Kbytes user FLASH
1. No security feature is absolutely secure. However, Freescale’s strategy is to make reading or copying the FLASH difficult for
unauthorized users.