参数资料
型号: MCC68HC711D3
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 3 MHz, MICROCONTROLLER, UUC
封装: DIE
文件页数: 88/157页
文件大小: 2252K
代理商: MCC68HC711D3
Central Processor Unit (CPU)
Data Sheet
MC68HC711D3 — Rev. 2
36
Central Processor Unit (CPU)
MOTOROLA
Figure 3-1. Programming Model
3.2.1 Accumulators A, B, and D
Accumulators A and B are general-purpose 8-bit registers that hold operands and
results of arithmetic calculations or data manipulations. For some instructions,
these two accumulators are treated as a single double-byte (16-bit) accumulator
called accumulator D. Although most instructions can use accumulators A or B
interchangeably, these exceptions apply:
The ABX and ABY instructions add the contents of 8-bit accumulator B to
the contents of 16-bit register X or Y, but there are no equivalent instructions
that use A instead of B.
The TAP and TPA instructions transfer data from accumulator A to the
condition code register or from the condition code register to accumulator A.
However, there are no equivalent instructions that use B rather than A.
The decimal adjust accumulator A (DAA) instruction is used after
binary-coded decimal (BCD) arithmetic operations, but there is no
equivalent BCD instruction to adjust accumulator B.
The add, subtract, and compare instructions associated with both A and B
(ABA, SBA, and CBA) only operate in one direction, making it important to
plan ahead to ensure that the correct operand is in the correct accumulator.
A:B
70
15
0
ACCUMULATOR A
ACCUMULATOR B
DOUBLE ACCUMULATOR D
INDEX REGISTER X
INDEX REGISTER Y
STACK POINTER
PROGRAM COUNTER
70
C
V
Z
N
I
H
X
S
D
IX
IY
SP
PC
CARRY
OVERFLOW
ZERO
NEGATIVE
I INTERRUPT MASK
HALF CARRY (FROM BIT 3)
X INTERRUPT MASK
STOP DISABLE
CCR
15
0
CONDITION CODE REGISTER
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