S3C72G9 datasheet(51/96 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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DECS

dst

Operation:

Operand

Operation Summary

Bytes

Cycles

R

Decrement register (R); skip on borrow

1

1 + S

RR

Decrement register pair (RR); skip on borrow

2

2 + S

Description:

The destination is decremented by one. An original value of 00H will underflow to 0FFH. If a

borrow occurs, a skip is executed. The carry flag value is unaffected.

Operand

Binary Code

Operation Notation

R

0

1

0

1

r2

r1

r0

R

← R-1; skip on borrow

RR

1

0

1

0

RR

← RR-1; skip on borrow

1

0

1

r2

r1

0

Examples:

1. Register pair HL contains the value 7FH (01111111B). The following instruction leaves the

value 7EH in register pair HL:

DECS

HL

2. Register A contains the value 0H. The following instruction sequence leaves the value 0FFH

in register A. Since a "borrow" occurs, the 'CALL PLAY1' instruction is skipped and the 'CALL

PLAY2' instruction is executed:

DECS

A

; "Borrow" occurs

CALL

PLAY1

; Skipped

CALL

PLAY2

; Executed

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