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The 8051 Instruction Set

1-51 Atmel 8051 Microcontrollers Hardware Manual

4316E–8051–01/07

1.14.35 ORL<dest-byte>

<src-byte>

Function: Logical-OR for byte variables

Description: ORL performs the bitwise logical-OR operation between the indicated variables, storing the results in the

destination byte. No flags are affected.

The two operands allow six addressing mode combinations. When the destination is the Accumulator, the source

can use register, direct, register-indirect, or immediate addressing; when the destination is a direct address, the

source can be the Accumulator or immediate data.

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

the output data latch, not the input pins.

Example: If the Accumulator holds 0C3H (11000011B) and R0 holds 55H (01010101B) then the following instruction,

ORL A,R0

leaves the Accumulator holding the value 0D7H (1101011lB).When the destination is a directly addressed byte,

the instruction can set combinations of bits in any RAM location or hardware register. The pattern of bits to be set

is determined by a mask byte, which may be either a constant data value in the instruction or a variable

computed in the Accumulator at run-time. The instruction,

ORL P1,#00110010B

sets bits 5, 4, and 1 of output Port 1.

ORL A,R

Bytes: 1

Cycles: 1

Encoding: 0 1 0 0 1 r r r

Operation: ORL

(A) ← (A)

∨

)

ORL A,direct

Bytes: 2

Cycles: 1

Encoding: 0 1 0 0 0 1 0 1 direct address

Operation: ORL

(A) ← (A)

∨

(direct)

ORL A,@R

Bytes: 1

Cycles: 1

Encoding: 0 1 0 0 0 1 1 i

Operation: ORL

(A) ← (A)

∨

((R

))

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 115 116

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