MC68HC908RK2 Datasheet, PDF (64/232 Pages) Motorola, Inc – Microcontroller Unit

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:
• 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
• 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.
Advance Information
64
Central Processor Unit (CPU)
MC68HC908RK2 — Rev. 4.0
MOTOROLA