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- 31st March 2011, 09:54 #1
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- Mar 2011
- 0 / 0
Help Watchdog, timer, and interrupt for AT89s52
Can anyone help? We need to use special function of the microcontroller like watchdog timer, timer, and interrupt for our project.
We are using assembly language, we are going to use those in LED, 7 segment and LCD.
I have here a sample program of our running lights of LED.
ORG 0H ; Start at address 00H JMP START_MAIN ; Goto address 80H ORG 80H ; Relocate Program at address 80H START_MAIN: MOV P0,#0FEH CALL DELAY MOV p0,#0FDH CALL DELAY MOV p0,#0FBH CALL DELAY MOV P0,#0F7H CALL DELAY MOV p0,#0EFH CALL DELAY MOV p0,#0DFH CALL DELAY MOV P0,#0BFH CALL DELAY MOV p0,#07FH CALL DELAY JMP START_MAIN DELAY: MOV R2,#10 ; Loop Register R2 = 3 ALOOP: MOV R3,#150 ; Loop Register R2 = 3 BLOOP: MOV R4,#150 ; Loop Register R2 = 3 CLOOP: DJNZ R4,CLOOP ; Decrement R0 and go CLOOP if not yet '0' DJNZ R3,BLOOP ; Decrement R0 and go BLOOP if not yet '0' DJNZ R2,ALOOP ; Decrement R0 and go ALOOP if not yet '0' RET ; Return back the last caller END ; Instruct ASM that Program Ends here
- 31st March 2011, 09:54
31st March 2011, 17:02 #2
- Join Date
- Apr 2010
- 367 / 367
Re: Help Watchdog, timer, and interrupt for AT89s52
please consult atmel or philips 8952 manual .
which gives the process of using them.