Swap nibbles within the Accumulator – SWAP A
SWAP A interchanges the low- and high-order nibbles (four-bit fields) of the Accumulator (bits 3 through 0 and bits 7 through 4). The operation can also be thought of as a 4-bit rotate instruction. No flags are affected.
Encoding: 1 1 0 0 0 1 0 0
The Accumulator holds the value 0C5H (11000101B). The instruction,
SWAP A
leaves the Accumulator holding the value 5CH (01011100B).
SWAP A interchanges the low- and high-order nibbles (four-bit fields) of the Accumulator (bits 3 through 0 and bits 7 through 4). The operation can also be thought of as a 4-bit rotate instruction. No flags are affected.
Encoding: 1 1 0 0 0 1 0 0
The Accumulator holds the value 0C5H (11000101B). The instruction,
SWAP A
leaves the Accumulator holding the value 5CH (01011100B).
ORG 0H MOV A, #0C5H ; A = C5B SWAP A ; A = 5CB END ; end of asm source file
Related topics:
8051 Complement Accumulator and Bit | 8051 Set Bit | 8051 Clear Accumulator and Bit | 8051 Rotate Accumulator | 8051 Exchange Accumulator | 8051 Exchange Digit | 8051 Push and Pop | 8051 No Operation
List of topics: 8051
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