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8051 Microcontroller (Internals, Instructions, Programming and Interfacing)
book

8051 Microcontroller (Internals, Instructions, Programming and Interfacing)

by Subrata Ghosal
May 2024
Intermediate to advanced content levelIntermediate to advanced
503 pages
17h 2m
English
Pearson India
Content preview from 8051 Microcontroller (Internals, Instructions, Programming and Interfacing)
60
ARITHMETIC OPERATIONS
e third instruction, MOV 30H, A is for storing the result from the accumulator in data memory
location 30H.  is is depicted through Fig. 5.4. Opcode of this instruction is F5H and it is a 2-byte instruction.
Being a MOV instruction, this does not aff ect any fl ags. However, it may be observed that the condition of
PSW remains unchanged even after execution of this MOV instruction.  e result of the addition (75H) is
now available in the memory location 30H.
Figure 5.3 Condition of status  ags after ADD instruction
Carry out
from bit 7
sets C flag
Odd number
of 1s in
accumulator
sets P flag
+
0111
0111 = D7H
0101 = 75H
1101 ...
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Publisher Resources

ISBN: 9781282655034Publisher Website