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DP80390 Instructions set details

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3.29.

ORL

Instruction:

ORL <dest-byte>, <src-byte>

Function:

Logical OR for byte variables

Description:

ORL performs the bit wise logical OR operation between the indicated

variables, storing the results in the destination byte. No flags are

affected (except P, if <dest-byte> = A).

The two operands allow six addressing mode combinations. When the

destination is the accumulator, the source can use register, direct,

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 will be read from the output data latch, not the

input pins.

3.29.1.

ORL A, RN

Operation:

(PC)

← (PC) + 1

(A)

← (A) or (Rn)

Bytes:

Cycles:

Encoding:

3.29.2.

ORL A, DIRECT

Operation:

(PC)

← (PC) + 2

(A)

← (A) or (direct)

Bytes:

Cycles:

Encoding:

direct address

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