S3C9234 Datasheet, PDF (92/214 Pages) Samsung semiconductor – 8-Bit CMOS Microcontroller

S3C9234/P9234
SAM88RCRI INSTRUCTION SET
INC — Increment
INC
Operation:
Flags:
Format:
dst
dst ¨ dst + 1
The contents of the destination operand are incremented by one.
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.
dst | opc
Bytes
1
Cycles Opcode
(Hex)
4
rE
r = 0 to F
Addr Mode
dst
r
opc
dst
2
4
20
R
4
21
IR
Examples:
Given: R0 = 1BH, register 00H = 0CH, and register 1BH = 0FH:
INC
R0
INC
00H
INC
@R0
→
R0 = 1CH
→
Register 00H = 0DH
→
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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