May 2024
Intermediate to advanced
534 pages
17h 58m
English
book
8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
by Subrata Ghoshal
Content preview from 8051 Microcontroller, Internals, Instructions, Programming and Interfacing, 2nd Edition
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62
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 fl 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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