S3C72G9 datasheet(95/96 Pages) SAMSUNG

Part #	S3C72G9

Description	SAM47 INSTRUCTION SET

Download	96 Pages

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Manufacturer	SAMSUNG [Samsung semiconductor]

Direct Link	http://www.samsung.com/Products/Semiconductor

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XCHI

dst,src

Operation:

Operand

Operation Summary

Bytes

Cycles

A,@HL

Exchange A and data memory contents; increment

contents of register L and skip on overflow

1

2 + S

Description:

The instruction XCHI exchanges the contents of the accumulator with the RAM location addressed

by register pair HL and then increments the contents of register L. If the content of register L is 0H,

a skip is executed. The value of the carry flag is unaffected.

Operand

Binary Code

Operation Notation

A,@HL

0

1

0

1

0

A

↔ (HL), then L ← L+1;

skip if L = 0H

Example:

Register pair HL contains the address 2FH and internal RAM location 2FH contains 0FH:

LD

HL,#2FH

LD

A,#0H

XCHI

A,@HL

; A

← 0FH and L ← L + 1 = 0, (HL) ← "0"

JPS

XXX

; Skipped since an overflow occurred

JPS

YYY

; H

← 2H, L ← 0H

YYY

XCHI

A,@HL

; (20H)

← 0FH, A ← (20H), L ← L + 1 = 1H

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

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