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The 8051 Instruction Set

Atmel 8051 Microcontrollers Hardware Manual 1-32

4316E–8051–01/07

1.14.10 CPL A

1.14.11 CPL bit

Function: Complement Accumulator

Description: CPLA logically complements each bit of the Accumulator (one’s complement). Bits which previously contained a

1 are changed to a 0 and vice-versa. No flags are affected.

Example: The Accumulator contains 5CH (01011100B). The following instruction,

CPL A

leaves the Accumulator set to 0A3H (10100011B).

Bytes: 1

Cycles: 1

Encoding: 1 1 1 1 0 1 0 0

Operation: CPL

(A) ← (A)

Function: Complement bit

Description: CPL bit complements the bit variable specified. A bit that had been a 1 is changed to 0 and vice-versa. No other

flags are affected. CLR can operate on the carry or any directly addressable bit.

Note: When this instruction is used to modify an output pin, the value used as the original data is read from the

output data latch, not the input pin.

Example: Port 1 has previously been written with 5BH (01011101B). The following instruction sequence,CPL P1.1CPL

P1.2 leaves the port set to 5BH (01011011B).

CPL C

Bytes: 1

Cycles: 1

Encoding: 1 0 1 1 0 0 1 1

Operation: CPL

CPL bit

Bytes: 2

Cycles: 1

Encoding: 1 0 1 1 0 0 1 0 bit address

Operation: CPL

(bit) ← (bit)

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 115 116

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Atmel C51 Handbuch Seite 34