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The 8051 Instruction Set

Atmel 8051 Microcontrollers Hardware Manual 1-56

4316E–8051–01/07

1.14.41 RL A

1.14.42 RLC A

Function: Rotate Accumulator Left

Description: The eight bits in the Accumulator are rotated one bit to the left. Bit 7 is rotated into the bit 0 position. No flags are

affected.

Example: The Accumulator holds the value 0C5H (11000101B). The following instruction,

RL A

leaves the Accumulator holding the value 8BH (10001011B) with the carry unaffected.

Bytes: 1

Cycles: 1

Encoding: 0 0 1 0 0 0 1 1

Operation: RL

+ 1) ← (A

) n = 0 - 6

) ← (A

)

Function: Rotate Accumulator Left through the Carry flag

Description: The eight bits in the Accumulator and the carry flag are together rotated one bit to the left. Bit 7 moves into the

carry flag; the original state of the carry flag moves into the bit 0 position. No other flags are affected.

Example: The Accumulator holds the value 0C5H(11000101B), and the carry is zero. The following instruction,

RLC A

leaves the Accumulator holding the value 8BH (10001010B) with the carry set.

Bytes: 1

Cycles: 1

Encoding: 0 0 1 1 0 0 1 1

Operation: RLC

+ 1) ← (A

) n = 0 - 6

) ← (C)

)

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Atmel C51 Handbuch Seite 58