Syntax error Instruction type STC in 8085 Microprocessor

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 −

STC

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: 2019-07-30T22:30:23+05:30

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