STC89C53RC datasheet(69/165 Pages) STC

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ORL

C, <src-bit>

Function:

Logical-OR for bit variables

Description:

Set the carry flag if the Boolean value is a logical 1; leave the carry in its current state

otherwise. A slash (“ / ”) preceding the operand in the assembly language indicates that the

logical complement of the addressed bit is used as the source value, but the source bit itself is

not affected. No other flags are affected.

Example:

Set the carry flag if and only if P1.0 = 1, ACC. 7 = 1, or OV = 0:

MOV

C, P1.0

;LOAD CARRY WITH INPUT PIN P10

ORL

C, ACC.7

;OR CARRY WITH THE ACC.BIT 7

ORL

C, /OV

;OR CARRY WITH THE INVERSE OF OV

ORL C, bit

Bytes:

Cycles:

Encoding:

0 1 1 1

0 0 1 0

bit address

Operation:

ORL

← (C)

ORL C, /bit

Bytes:

Cycles:

Encoding:

1 0 1 0

0 0 0 0

bit address

Operation:

ORL

← (C)

POP direct

Function:

Pop from stack

Description:

The contents of the internal RAM location addressed by the Stack Pointer is read, and the

Stack Pointer is decremented by one. The value read is then transferred to the directly

addressed byte indicated. No flags are affected.

Example:

The Stack Pointer originally contains the value 32H, and internal RAM locations 30H

through 32H contain the values 20H, 23H, and 01H, respectively. The instruction sequence,

POP

DPH

POP

DPL

will leave the Stack Pointer equal to the value 30H and the Data Pointer set to 0123H. At this

point the instruction,

POP

will leave the Stack Pointer set to 20H. Note that in this special case the Stack Pointer was

decremented to 2FH before being loaded with the value popped (20H).

Bytes:

Cycles:

Encoding:

1 1 0 1

0 0 0 0

direct address

Operation:

POP

(diect) ← ((SP))

((SP))

(SP) ← (SP)-1

← (SP)-1

(SP) - 1

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