MC68HC08AS32 Datasheet, PDF (114/280 Pages) Motorola, Inc – M68HC08 Family of 8-bit microcontroller units (MCUs)

7.3 CPU Registers
Figure 7-1 shows the five CPU registers. CPU registers are not part of the memory
map.
15
H
15
15
7
0
ACCUMULATOR (A)
0
X
INDEX REGISTER (H:X)
0
STACK POINTER (SP)
0
PROGRAM COUNTER (PC)
7
0
V 1 1 H I N Z C CONDITION CODE REGISTER (CCR)
CARRY/BORROW FLAG
ZERO FLAG
NEGATIVE FLAG
INTERRUPT MASK
HALF-CARRY FLAG
TWO’S COMPLEMENT OVERFLOW FLAG
Figure 7-1. CPU Registers
7.3.1 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.
Bit 7
Read:
Write:
Reset:
6
5
4
3
2
Unaffected by reset
Figure 7-2. Accumulator (A)
1
Bit 0
Data Sheet
114
MC68HC08AS32 — Rev. 4.1
Freescale Semiconductor