MC68HC908GP32 Datasheet, PDF (149/410 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

Freescale Semiconductor, Inc.
Technical Data – MC68HC908GP32•MC68HC08GP32
Section 10. Central Processor Unit (CPU)
10.1 Contents
10.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
10.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
10.4 CPU Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
10.4.1 Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .149
10.4.2 Index Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
10.4.3 Stack Pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
10.4.4 Program Counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
10.4.5 Condition Code Register . . . . . . . . . . . . . . . . . . . . . . . . . .152
10.5 Arithmetic/Logic Unit (ALU) . . . . . . . . . . . . . . . . . . . . . . . . . .154
10.6 Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .154
10.6.1 Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
10.6.2 Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
10.7 CPU During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . 155
10.8 Instruction Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
10.9 Opcode Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
10.2 Introduction
The M68HC08 CPU (central processor unit) 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.
MC68HC908GP32•MC68HC08GP32 — Rev. 6
MOTOROLA
Central Processor Unit (CPU)
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Technical Data
147