Atmel C51 Manual descarregar pdf (Página 59)

The 8051 Instruction Set

1-57 Atmel 8051 Microcontrollers Hardware Manual

4316E–8051–01/07

1.14.43 RR A

1.14.44 RRC 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 following instruction,

RR A

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

Bytes: 1

Cycles: 1

Encoding: 0 0 0 0 0 0 1 1

Operation: RR

) ← (A

+ 1) n = 0 - 6

) ← (A

)

Function: Rotate Accumulator Right through 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), the carry is zero. The following instruction,

RRC A

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

Bytes: 1

Cycles: 1

Encoding: 0 0 0 1 0 0 1 1

Operation: RRC

) ← (A

+ 1) n = 0 - 6

) ← (C)

)

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 115 116

Sem comentários

Atmel C51 Manual Página 59