MC908GR8CDWE Datasheet, PDF (139/408 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

Freescale Semiconductor, Inc.
Technical Data — MC68HC908GR8
Section 10. Central Processing Unit (CPU)
10.1 Contents
10.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
10.3 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
10.4 CPU registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
10.5 Arithmetic/logic unit (ALU) . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
10.6 Low-power modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .145
10.7 CPU during break interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . 146
10.8 Instruction Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147
10.9 Opcode Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154
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.
10.3 Features
• 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
MC68HC908GR8 — Rev 4.0
MOTOROLA
Central Processing Unit (CPU)
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Technical Data
139