Central Processor Unit (CPU)
CPU Registers
MC68HC908AB32 — Rev. 1.0 Technical Data
MOTOROLA Central Processor Unit (CPU) 91
Figure 7-1. CPU Registers
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.
ACCUMULATOR (A)
INDEX REGISTER (H:X)
STACK POINTER (SP)
PROGRAM COUNTER (PC)
CONDITION CODE REGISTER (CCR)
CARRY/BORROW FLAG
ZERO FLAG
NEGATIVE FLAG
INTERRUPT MASK
HALF-CARRY FLAG
TWO’S COMPLEMENT OVERFLOW FLAG
V11H I NZC
H X
0
0
0
0
7
15
15
15
70
Bit 7 654321Bit 0
Read:
Write:
Reset: Unaffected by reset
Figure 7-2. Accumulator (A)
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