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G
Byte processing arithmetic operation of accumulator
When the arithmetic operation instruction for byte processing is executed for the AL register, the higher 8
bits of the AL register in pre-operation are ignored, and the higher 8 bits of the operation result become all
"0".
G
Reset value of accumulator
The reset value is undefined.
Figure 3.2-4 Example of 8-bit Data Transfer to Accumulator (A) (Data Saving)
MOVW A,3000
H
AH
Before
XXXX
execution
2456
After
execution
Figure 3.2-5 Example of 8-bit Data Transfer to Accumulator (A) (Data Saving, Zero-extended)
MOV A,3000
H
AH
Before
XXXX
execution
After
2456
execution
(Instruction of storing 3000
AL
2456
H
H
B5
DTB
H
7788
H
H
(Instruction that extends 3000
AL
2456
H
H
B5
DTB
H
0088
H
H
address data in registers)
H
Memory space
MSB
B53001
77
H
H
X: Undefined
MSB: Most significant bit
LSB: Least significant bit
DTB: Data bank register
address data and stores in registers)
H
Memory space
MSB
B53001
77
H
H
X
Undefined
MSB Most significant bit
LSB
Least significant bit
DTB
Data bank register
CHAPTER 3 CPU
LSB
B53000
88
H
H
LSB
88
B53000
H
H
35
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