Swap nibbles within the Accumulator
| Instruction | SWAP A |
|---|---|
| Function | Swap nibbles within the Accumulator |
| Bytes | 1 |
| Cycles | 1 |
| Encoding | 0 1 0 0 0 1 0 0 |
| Operation | A3-0 swap A7-4 |
| Description | 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. |
| Flags Affected | C AC F0 RS1 RS0 OV P |
| Example | The Accumulator holds the value 0C5H (11000101B). The instruction, SWAP A leaves the Accumulator holding the value 5CH (01011100B). |
| Bytes: Number of bytes required to encode the instruction. Cycles: Number of instruction cycles required to execute the instruction. Note that there are 12 oscillator cycles to one instruction cycle on a standard 8051. Encoding: Lists the byte encoding for the instruction. Operation: Lists, step-by-step, the operations performed by the instruction. Flags Affected: are highlighted in Bold | |
Related topics:
8051 Logical Operation Instructions | 8051 ANL Instruction | 8051 ORL Instruction | 8051 XRL Instruction | 8051 CLR Instruction | 8051 CPL Instruction | 8051 RL Instruction | 8051 RR Instruction | 8051 RLC Instruction | 8051 RRC Instruction
List of topics: 8051
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