1 second Interrupt from 8051?

[snabilat]

hi here is subroutine for cal. of 1 sec delay

HUNDERED EQU 100
COUNT EQU -10000 ;100*10000 US=1SEC
DELAY: MOV R7,#HUNDERED
AGAIN: MOV TH0,#HIGH COUNT
MOV TL0,LOW COUNT
SETB TR0
WAIT2: JNB TF0,$
CLR TF0
CLR TR0
DJNZ R7,AGAIN
RET
END
****************************************************

The clock used is a 12MHz .

 

[Saeedafzalkhan]

This subroutine is for 1 sec delay

The clock used is a 12MHz .

HUNDERED EQU 100
COUNT EQU -10000 ;100*10000 US=1SEC
DELAY: MOV R7,#HUNDERED
AGAIN: MOV TH0,#HIGH COUNT
MOV TL0,LOW COUNT
SETB TR0
WAIT2: JNB TF0,$
CLR TF0
CLR TR0
DJNZ R7,AGAIN
RET
END

 

[rellutzu]

Sorry for the interrupt guys, but.... the last two solutions provided for this problem look alike eachother veeeerry much...
Is someone in need for points?

 

[polymath]

Hi all
I notice that no one has asked - what the required timing tolerance on the 1 Second interval?

Does the micro have to action a port pin within ±1µs of 'real time' then this is a will place various constraints on the method used.
If tolerance is ±50ms constraints are more relaxed. If it is a display update this will be different again.

Clarification of the timing requirement might help in the solution.

regards ... Polymath