MC68HC708AS48 FREESCALE [Freescale Semiconductor, Inc], MC68HC708AS48 Datasheet - Page 81

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MC68HC708AS48

Manufacturer Part Number
MC68HC708AS48
Description
Advance Information
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
7.4 CPU Registers
Figure 7-1
the memory map.
7.4.1 Accumulator
The accumulator is a general-purpose 8-bit register. The CPU uses the
accumulator to hold operands and the results of arithmetic/logic
operations.
Read:
Write:
Reset:
MC68HC708AS48
Rev. 4.0
MOTOROLA
shows the five CPU registers. CPU registers are not part of
7
15
H
X
15
15
7
V 1 1 H I N Z C
Figure 7-1. CPU Registers
Bit 7
6
5
Unaffected by Reset
Figure 7-2. Accumulator (A)
Central Processor Unit (CPU)
Central Processor Unit (CPU)
CPU Registers
0
ACCUMULATOR (A)
0
INDEX REGISTER (H:X)
0
STACK POINTER (SP)
0
PROGRAM COUNTER (PC)
0
CONDITION CODE REGISTER (CCR)
CARRY/BORROW FLAG
ZERO FLAG
NEGATIVE FLAG
INTERRUPT MASK
HALF-CARRY FLAG
TWO’S COMPLEMENT OVERFLOW FLAG
4
3
2
1
Advance Information
Bit 0
81

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