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Instruction type STC in 8085 Microprocessor
In 8085 Instruction set, STC stands for “SeT the Carry flag”. It sets the cy flag to the 1 state, immaterial of its earlier value. It performs set operation on the cy flag, and the result is stored back in the cy flag.
| Mnemonics, Operand | Opcode(in HEX) | Bytes |
|---|---|---|
| STC | 37 | 1 |
The result of execution of this instruction has been depicted in the following tracing table −
| Before | After | |
|---|---|---|
(Cy) |
1 | 1 |
(Cy) |
0 | 1 |
| Address | Hex Codes | Mnemonic | Comment |
|---|---|---|---|
| 2000 | 37 | STC | Set the Cy flag i.e. set Cy=1 |
The timing diagram against this instruction STC execution is as follows −
Summary − So this instruction STC 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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