S3C9442 datasheet(23/50 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

6-23

INC — Increment

INC

dst

Operation:

dst

← dst + 1

The contents of the destination operand are incremented by one.

Flags:

C:

Unaffected.

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 dst value is + 127 (7FH) and result is – 128 (80H);

cleared otherwise.

Format:

Bytes

Cycles

Opcode

(Hex)

Addr Mode

dst

dst | opc

1

4

rE

r

r = 0 to F

opc

dst

2

4

20

R

4

21

IR

Examples:

Given: R0 = 1BH, register 00H = 0CH, and register 1BH = 0FH:

INC

R0

→

R0 = 1CH

INC

00H

→

Register 00H = 0DH

INC

@R0

→

R0 = 1BH, register 01H = 10H

In the first example, if destination working register R0 contains the value 1BH, the statement "INC

R0" leaves the value 1CH in that same register.

The next example shows the effect an INC instruction has on register 00H, assuming that it

contains the value 0CH.

In the third example, INC is used in Indirect Register (IR) addressing mode to increment the value

of register 1BH from 0FH to 10H.

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