MC68HC705JP7 Datasheet, PDF (46/242 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Central Processor Unit (CPU)
7
0
A
ACCUMULATOR (A)
7
0
X
INDEX REGISTER (X)
15
65
0000000011
SP
0
STACK POINTER (SP)
15
10
87
0
111
PCH
PCL
PROGRAM COUNTER (PC)
7
54
0
1 1 1 H I N Z C CONDITION CODE REGISTER (CCR)
HALF-CARRY FLAG
INTERRUPT MASK
NEGATIVE FLAG
ZERO FLAG
CARRY/BORROW FLAG
Figure 3-1. M68HC05 Programming Model
3.3 Accumulator
The accumulator is a general-purpose 8-bit register as shown in
Figure 3-2. The CPU uses the accumulator to hold operands and results
of arithmetic and non-arithmetic operations.
Bit 7
Read:
Write:
Reset:
6
5
4
3
2
Unaffected by reset
Figure 3-2. Accumulator (A)
1
Bit 0
Advance Information
46
MC68HC705JJ7 • MC68HC705JP7 — REV 4
Central Processor Unit (CPU)
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