Samsung 8-Bit Bedienungsanleitung PDF herunterladen (Seite 339)

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101

S3C9228/P9228 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.

D: Unaffected.

H: Unaffected.

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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