S3C9442 datasheet(47/50 Pages) SAMSUNG

Part #	S3C9442

Description	SAM88RCRI INSTRUCTION SET

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Manufacturer	SAMSUNG [Samsung semiconductor]

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S3C9442/C9444/F9444/C9452/C9454/F9454

SAM88RCRI INSTRUCTION SET

6-47

SUB — Subtract

SUB

dst,src

Operation:

dst

← dst – src

The source operand is subtracted from the destination operand and the result is stored in the

destination. The contents of the source are unaffected. Subtraction is performed by adding the

two's complement of the source operand to the destination operand.

Flags:

C:

Set if a "borrow" occurred; cleared otherwise.

Z:

Set if the result is "0"; cleared otherwise.

S:

Set if the result is negative; cleared otherwise.

V:

Set if arithmetic overflow occurred, that is, if the operands were of opposite signs and the sign of

the result is of the same as the sign of the source operand; cleared otherwise.

Format:

Bytes

Cycles

Opcode

(Hex)

Addr Mode

dst

src

opc

dst | src

2

4

22

r

6

23

r

lr

opc

src

dst

3

6

24

R

6

25

R

IR

opc

dst

src

3

6

26

R

IM

Examples:

Given: R1 = 12H, R2 = 03H, register 01H = 21H, register 02H = 03H, register 03H = 0AH:

SUB

R1,R2

→

R1 = 0FH, R2 = 03H

SUB

R1,@R2

→

R1 = 08H, R2 = 03H

SUB

01H,02H

→

Register 01H = 1EH, register 02H = 03H

SUB

01H,@02H

→

Register 01H = 17H, register 02H = 03H

SUB

01H,#90H

→

Register 01H = 91H; C, S, and V = "1"

SUB

01H,#65H

→

Register 01H = 0BCH; C and S = "1", V = "0"

In the first example, if working register R1 contains the value 12H and if register R2 contains the

value 03H, the statement "SUB R1,R2" subtracts the source value (03H) from the destination

value (12H) and stores the result (0FH) in destination register R1.

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