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Instruction type CMC in 8085 Microprocessor
In 8085 Instruction set, CMC stands for “CoMplement the Carry flag”. It performs complement operation on the cy flag, and the result is stored back in the cy flag.
| Mnemonics, Operand | Opcode(in HEX) | Bytes |
|---|---|---|
| CMC | 3F | 1 |
The result of execution of this instruction has been depicted in the following tracing table −
| Before | After | |
|---|---|---|
(Cy) |
1 | 0 |
| Address | Hex Codes | Mnemonic | Comment |
|---|---|---|---|
| 2001 | 3F | CMC | Complement of Cy when Cy=1 |
The timing diagram against this instruction CMC execution is as follows −
Summary − So this instruction CMC requires 1-Byte, 1-Machine Cycle (Opcode Fetch) and 4 T-States for execution as shown in the timing diagram.
Updated on: 30-Jul-2019
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