Programming timer0 in PIC 16f628

mshemyalnisar · Nov 24, 2008

thanks pommie......

but 1 thing that i didnt understand is the "this is never executed" bit..... what is that supposed to mean??

Pommie · Nov 24, 2008

If you trace the path of execution you will see that the portion I highlighted (plus the return instruction) never gets executed.

Mike.

mshemyalnisar · Nov 24, 2008

i got it ............. thanks a heaven.......

in another part of the coursework i am required to use delay functions to generate delay of 1sec, 750ms, 500ms and 250ms.

can you check that the code i wrote for the delay function is correct??

delay1s movlw D'1249994' ;
movwf D_Ctr1 ;
D_L1 nop ;
decfsz D_Ctr1 ;
goto D_L1 ;
nop ;
return ;

delay750ms movlw D'937498' ;
movwf D_Ctr1 ;
D_L1 nop ;
decfsz D_Ctr1 ;
goto D_L1 ;
nop ;
return ;

delay500ms movlw D'624994' ;
movwf D_Ctr1 ;
D_L1 nop ;
decfsz D_Ctr1 ;
goto D_L1 ;
nop ;
return ;

delay250ms movlw D'312494' ;
movwf D_Ctr1 ;
D_L1 nop ;
decfsz D_Ctr1 ;
goto D_L1 ;
nop ;
return ;

Pommie · Nov 24, 2008

Your theory is correct as to how you would generate a delay but unfortunately the biggest number that W can hold is 255 and so movlw D'624944' would actually load W with 48. For seeing how longer delays are generated see .

One other thing, when posting code if you type

Code:

 before it and

after it then it will keep it's format.

Mike.

Programming timer0 in PIC 16f628

mshemyalnisar

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