S3C72G9 datasheet(94/96 Pages) SAMSUNG

Part #	S3C72G9

Description	SAM47 INSTRUCTION SET

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Manufacturer	SAMSUNG [Samsung semiconductor]

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XCHD

dst,src

Operation:

Operand

Operation Summary

Bytes

Cycles

A,@HL

Exchange A and data memory contents; decrement

contents of register L and skip on borrow

1

2 + S

Description:

The instruction XCHD exchanges the contents of the accumulator with the RAM location

addressed by register pair HL and then decrements the contents of register L. If the content of

register L is 0FH, the next instruction is skipped. The value of the carry flag is unaffected.

Operand

Binary Code

Operation Notation

A,@HL

0

1

0

1

A

↔ (HL), then L ← L-1;

skip if L = 0FH

Example:

Register pair HL contains the address 20H and internal RAM location 20H contains the value 0FH:

LD

HL,#20H

LD

A,#0H

XCHD

A,@HL

; A

← 0FH and L ← L - 1, (HL) ← "0"

JPS

XXX

; Skipped since a borrow occurred

JPS

YYY

; H

← 2H, L ← 0FH

YYY

XCHD

A,@HL

; (2FH)

← 0FH, A ← (2FH), L ← L - 1 = 0EH

The 'JPS YYY' instruction is executed since a skip occurs after the XCHD instruction.

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