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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102
SUBROUTINES AND STACK
NEXT1: MOV A, P1 ; read thermal value through port P1
CLR C ; clear carry fl ag
SUBB A, #0AAH ; check for threshold
JC NEXT2 ; within limits, check next port
MOV P3, #55H ; limit crossed, raise alarm
NEXT2: MOV A, P2 ; read thermal value through port P2
CLR C ; clear carry fl ag
SUBB A, #0AAH ; check for threshold
JC NEXT3 ; within limits, check next port
MOV P3, #55H ; limit crossed, raise alarm
NEXT3: SJMP START ; loop on
is program would function properly and keep on checking all three ports in the same sequence and raising
an alarm, when the preset threshold limit of AAH exceeds.
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