Freescale Semiconductor, Inc.
Central Processor Unit (CPU)
5.2 Introduction
The M68HC08 CPU is an enhanced and fully object-code-compatible
version of the M68HC05 CPU. The CPU08 Reference Manual, Motorola
document order number CPU08RM/AD, contains a description of the
CPU instruction set, addressing modes, and architecture.
5.3 Features
Features of the CPU include:
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Object code fully upward-compatible with M68HC05 Family
16-bit stack pointer with stack manipulation instructions
16-bit index register with X-register manipulation instructions
4-MHz CPU internal bus frequency
64-Kbyte program/data memory space
16 addressing modes
Memory-to-memory data moves without using accumulator
Fast 8-bit by 8-bit multiply and 16-bit by 8-bit divide instructions
Enhanced binary-coded decimal (BCD) data handling
Modular architecture with expandable internal bus definition for
extension of addressing range beyond 64 Kbytes
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Low-power stop and wait modes
5.4 CPU Registers
Figure 5-1 shows the five CPU registers. CPU registers are not part of
the memory map.
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MC68HC908RFRK2
Central Processor Unit (CPU)
MOTOROLA
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