STC89LE53RC datasheet(72/165 Pages) STC

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RLC 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 instruction,

RLC

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

Bytes:

Cycles:

Encoding:

0 0 1 1

Operation:

RLC

(An

+1) ← (A

← (A

(An) n = 0-6

(A0) ← (C)

← (C)

(C)

← (A

(A7)

RR A

Function:

Rotate Accumulator Right

Description:

The eight bits in the Accumulator are rotated one bit to the right. Bit 0 is rotated into the bit 7

position. No flags are affected.

Example:

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

leaves the Accumulator holding the value 0E2H (11100010B) with the carry unaffected.

Bytes:

Cycles:

Encoding:

0 0 0 0

0 0 1 1

Operation:

(An) ← (A

← (A

(An+1) n = 0 - 6

(A7) ← (A

← (A

(A0)

RRC A

Function:

Rotate Accumulator Right through the Carry flag

Description:

The eight bits in the Accumulator and the carry flag are together rotated one bit to the right.

Bit 0 moves into the carry flag; the original value of the carry flag moves into the bit 7

position.No other flags are affected.

Example:

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

RRC

leaves the Accumulator holding the value 62H (01100010B) with the carry set.

Bytes:

Cycles:

Encoding:

0 0 0 1

0 0 1 1

Operation:

RRC

(An

+1) ← (A

← (A

(An) n = 0-6

(A7) ← (C)

← (C)

(C)

← (A

(A0)

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