MC68HC08AS32 Datasheet, PDF (75/394 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

Advance Information — MC68HC08AS32
Section 7. Central Processor Unit (CPU)
7.1 Contents
7.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
7.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
7.4 CPU Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
7.4.1 Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
7.4.2 Index Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78
7.4.3 Stack Pointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
7.4.4 Program Counter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
7.4.5 Condition Code Register . . . . . . . . . . . . . . . . . . . . . . . . . . .81
7.5 Arithmetic/Logic Unit (ALU) . . . . . . . . . . . . . . . . . . . . . . . . . . .83
7.6 CPU During Break Interrupts . . . . . . . . . . . . . . . . . . . . . . . . . .83
7.7 Instruction Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84
7.8 Opcode Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
7.2 Introduction
This section describes the central processor unit (CPU). The M68HC08
CPU is an enhanced and fully object-code-compatible version of the
M68HC05 CPU. The CPU08 Reference Manual (Motorola document
number CPU08RM/AD) contains a description of the CPU instruction
set, addressing modes, and architecture.
MC68HC08AS32 — Rev. 3.0
MOTOROLA
Central Processor Unit (CPU)
Advance Information
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