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MC908MR32CFUE Datasheet, PDF (79/282 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Chapter 7
Central Processor Unit (CPU)
7.1 Introduction
The M68HC08 CPU (central processor unit) is an enhanced and fully object-code-compatible version of
the M68HC05 CPU. The CPU08 Reference Manual (document order number CPU08RM/AD) contains a
description of the CPU instruction set, addressing modes, and architecture.
7.2 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
⢠8-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
7.3 CPU Registers
Figure 7-1 shows the five CPU registers. CPU registers are not part of the memory map.
MC68HC908MR32 ⢠MC68HC908MR16 Data Sheet, Rev. 6.1
Freescale Semiconductor
79
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