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MSM80C154S/83C154S/85C154HVS

280

30. DEC @Rr (Decrement indirect address)

0001011r

70

Instruction code

Operation

Number of bytes

Number of cycles

Flags

(PSW)

Description

Example DEC @R0

Instruction code

: Byte 1

((Rr))←((Rr))–1 r=0 or 1:

C AC F0 RS1 RS0 OV F1 P

:

:

:

The contents of the data memory location addressed by the

register r contents are decremented by 1.

:

00010110

70

Byte 1

Register 0

01101010

70

1

1

Before execution

Register 0

01101010

70

After execution

:

6AH

10010000

70

6AH

10001111

70