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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