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MSM80C154S/83C154S/85C154HVS
358
98. SUBB A, @Rr (Substract indirect address from accumulator with borrow)
1001011r
70
Instruction code
Operation
Number of bytes
Number of cycles
Flags
(PSW)
Description
Example SUBB A, @R0
Instruction code
: Byte 1
(A)←(A)–((C)+((Rr))) r=0 or 1:
C AC F0 RS1 RS0 OV F1 P
•• • •
:
:
:
The carry flag content and the data memory location contents
addressed by the register r contents are substracted from the
accumulator contents. The result is placed in the accumulator,
and the flags are updated.
:
10010110
70
Byte 1
Accumulator
01010100
70
1
1
Before execution
Accumulator
10000010
70
After execution
:
Register 0
01000111
70
Register 0
01000111
70
47H
11010010
70
47H
11010010
70
0
Carry flag
1
Carry flag
0
Auxiliary carry flag
0
Auxiliary carry flag
0
Overflow flag
1
Overflow flag