AN1218 Datasheet, PDF (1/56 Pages) Freescale Semiconductor, Inc – HC05 to HC08 Optimization

Freescale Semiconductor
Order this document
by AN1218/D Rev. 2
AN1218
HC05 to HC08 Optimization
By Mark Glenewinkel
CSIC Applications
Austin, Texas
Introduction
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.
© Freescale Semiconductor, Inc., 2004. All rights reserved.
AN1218 Rev. 2
For More Information On This Product,
Go to: www.freescale.com