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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358
CASE STUDY: A HOME PROTECTION SYSTEM
Figure 25.7 Flowchart for Timer 0 interrupt service routine
Timer 0 interrupt
Return from Timer 0 interrupt
Is
IRLED bit set
?
Complement P0.4.
Decrement R7 by 1.
Is
R7 (bank #0) =0
?
Ye s
Ye s
No
No
Reload R7 by 09H.
Set bit P0.4.
Clear bit IRLED.
ISR of
Timer 0
Generate 4 cycles at
30 KHz in every one
millisecond for IR
transmitter LED
ISR of
INT0
ISR of
Timer 1
Increment
At every 8 milliseconds
if R2 = 0 then
start alarm
Otherwise
clear R2
Register R2
of bank #1
by one
Figure 25.6 Schematic of IR sensor handling for INT0 using Timer 0 and Timer 1
25.3.2 | External Interrupts’ Routines
ese external interrupts would be generated almost ...
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