Atmel C51 Manual descarregar pdf (Página 33)

The 8051 Instruction Set

1-31 Atmel 8051 Microcontrollers Hardware Manual

4316E–8051–01/07

1.14.8 CLR A

1.14.9 CLR bit

Function: Clear Accumulator

Description: CLR A clears the Accumulator (all bits set to 0). No flags are affected

Example: The Accumulator contains 5CH (01011100B). The following instruction,CLR Aleaves the Accumulator set to 00H

(00000000B).

Bytes: 1

Cycles: 1

Encoding: 1 1 1 0 0 1 0 0

Operation: CLR

(A) ← 0

Function: Clear bit

Description: CLR bit clears the indicated bit (reset to 0). No other flags are affected. CLR can operate on the carry flag or any

directly addressable bit.

Example: Port 1 has previously been written with 5DH (01011101B). The following instruction,CLR P1.2 leaves the port set

to 59H (01011001B).

CLR C

Bytes: 1

Cycles: 1

Encoding: 1 1 0 0 0 0 1 1

Operation: CLR

CLR bit

Bytes: 2

Cycles: 1

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

Operation: CLR

(bit) ← 0

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 115 116

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Atmel C51 Manual Página 33