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AN1218

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AN1218 数据手册

Freescale Semiconductor

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by AN1218/D Rev. 2

AN1218

HC05 to HC08 Op tim iza tion

By Mark Glenewinkel

CSIC Applications

Austin, Texas

Introd uc tion

Freescale's HC05 Family of microcontrollers contains the world's most

popular 8-bit microcontroller units (MCUs). In keeping pace with

technology and the changing needs of the customer, Freescale has

designed the HC08 Family of MCUs. The HC08 Family CPU is a

performance extension to the HC05 Family of low cost MCUs. This

application note will describe the differences and advantages of the

HC08 Family CPU: the CPU08.

CPU08 is fully opcode and object code compatible with the HC05 CPU.

Any HC05 code will execute directly on the HC08 without instruction set

differences. As this application note will show, there are many

improvements to the speed and capability in the CPU08.

CPU08 is a faster processor. The basic execution speed of the CPU08

has been increased with advanced high performance CMOS

technology. Execution cycles of most instructions have been improved

with an advanced computer architecture.

CPU08 has more programming capability. It has more addressing

modes, better math support, and much improved data manipulation,

accessing, and moving capabilities. Looping and branching instructions

have also been optimized.

AN1218 Rev. 2

For More Information On This Product,

Go to: www.freescale.com

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