![background image](http://html.mh-extra.com/html/motorola/mc68hc908gp32/mc68hc908gp32_technical-data-manual_245608149.webp)
MC68HC908GP32
•
MC68HC08GP32
—
Rev. 6
Technical Data
MOTOROLA
Central Processor Unit (CPU)
147
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.
F
re
e
sc
a
le
S
e
m
ic
o
n
d
u
c
to
r,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
c
.
..