STC89LE53RC datasheet(70/165 Pages) STC

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PUSH direct

Function:

Push onto stack

Description:

The Stack Pointer is incremented by one. The contents of the indicated variableis then copied

into the internal RAM location addressed by the Stack Pointer. Otherwise no flags are

affected.

Example:

On entering interrupt routine the Stack Pointer contains 09H. The Data Pointer holds the

value 0123H. The instruction sequence,

PUSH

DPL

PUSH

DPH

will leave the Stack Pointer set to 0BH and store 23H and 01H in internal RAM locations

0AH and 0BH, respectively.

Bytes:

Cycles:

Encoding:

1 1 0 0

0 0 0 0

direct address

Operation:

PUSH

(SP) ← (SP)+1

← (SP)+1

(SP) + 1

((SP)) ← (direct)

← (direct)

(direct)

RET

Function:

Return from subroutine

Description:

RET pops the high-and low-order bytes of the PC successively from the stack, decrementing

the Stack Pointer by two. Program execution continues at the resulting address, generally the

instruction immediately following an ACALL or LCALL. No flags are affected.

Example:

The Stack Pointer originally contains the value 0BH. Internal RAM locations 0AH and 0BH

contain the values 23H and 01H, respectively. The instruction,

RET

will leave the Stack Pointer equal to the value 09H. Program execution will continue at

location 0123H.

Bytes:

Cycles:

Encoding:

0 0 1 0

Operation:

RET

(PC

15-8) ← ((SP))

← ((SP))

((SP))

(SP) ← (SP) -1

← (SP) -1

(SP) -1

(PC

7-0) ← ((SP))

← ((SP))

((SP))

(SP) ← (SP) -1

← (SP) -1

(SP) -1

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