S3C72G9 datasheet(40/96 Pages) SAMSUNG

Part #	S3C72G9

Description	SAM47 INSTRUCTION SET

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Manufacturer	SAMSUNG [Samsung semiconductor]

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BTST

dst.b

Operation:

Operand

Operation Summary

Bytes

Cycles

C

Test carry bit and skip if set (= "1")

1

1 + S

DA.b

Test specified bit and skip if memory bit is set

2

2 + S

mema.b

2

2 + S

memb.@L

2

2 + S

@H+DA.b

2

2 + S

Description:

The specified bit within the destination operand is tested. If it is "1", the instruction that

immediately follows the BTST instruction is skipped; otherwise the instruction following the BTST

instruction is executed. The destination bit value is not affected.

Operand

Binary Code

Operation Notation

C

1

0

1

0

1

Skip if C = 1

DA.b

1

b1

b0

0

1

Skip if DA.b = 1

a7

a6

a5

a4

a3

a2

a1

a0

mema.b

1

0

1

Skip if mema.b = 1

memb.@L

1

0

1

Skip if [memb.7-2 + L.3-2].

[L.1-0] = 1

0

1

0

a5

a4

a3

a2

@H+DA.b

1

0

1

Skip if [H + DA.3-0].b = 1

0

b1

b0

a3

a2

a1

a0

Second Byte

Bit Addresses

mema.b

1

0

b1

b0

a3

a2

a1

a0 FB0H-FBFH

1

b1

b0

a3

a2

a1

a0 FF0H-FFFH

Examples:

1. If RAM bit location 30H.2 is set to “0”, the following instruction sequence will execute the RET

instruction:

BTST

30H.2

; If 30H.2 = "1", then skip

RET

; If 30H.2 = "0", return

JP

LABEL2

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