PIC18F452 Timer adjustment
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1 PIC18F452 Wilfrid Laurier University January 23, 2018 PIC18F452
2 Here s a code fragment for the timer: PIC18F452
3 Here s a code fragment for the timer: t i m e a d j equ d d d movff TMR0L, templ ; read 16 b i t c o u n t e r movff TMR0H, temph ; get b u f f e r e d high h a l f movlw low t i m e a d j ; add time adjustment addwf templ, F movlw h igh t i m e a d j addwfc temph, F movff temph,tmr0h ; pre l o a d h i gh h a l f movff templ,tmr0l ; w r i t e 16 b i t c o u n t e r b c f INTCON, TMR0IF ; c l e a r f l a g PIC18F452
4 Whether using polling or interrupts, this section of code is used to reload the timer after an overflow. PIC18F452
5 Whether using polling or interrupts, this section of code is used to reload the timer after an overflow. Following is an explanation of what it does, and why it s important. PIC18F452
6 Whether using polling or interrupts, this section of code is used to reload the timer after an overflow. Following is an explanation of what it does, and why it s important. For instance, the line timeadj equ d d d needs some explanation. PIC18F452
7 timer value at interrupt service From the interrupt, (or after the flag is polled), until it gets processed, some time passes. PIC18F452
8 timer value at interrupt service Probably only a few cycles, but important for precise timing. PIC18F452
9 ideal reload value PIC18F452
10 ideal reload value Interval desired is from ideal value to overflow (eg. FFFF) PIC18F452
11 must subtract current value from countdown interval For instance, for an interval of cycles, we would nominally want to reload with d d PIC18F452
12 must subtract current value from countdown interval We must subtract the time that happened before the interrupt service (or poll response). PIC18F452
13 movff TMR0L,templ First we must load the timer value, low byte first. This latches the high byte. (2 cycles for this instruction). PIC18F452
14 movff TMR0H,temph Next we read the (latched) high timer byte. (2 cycles; 4 so far) PIC18F452
15 movlw low adjust PIC18F452
16 movlw low adjust Begin the subtraction. (1 cycle for this instruction; 5 so far). PIC18F452
17 addwf templ,f (Actually, instead of subtracting, we add to the reload value.) PIC18F452
18 addwf templ,f Add the low bytes. (1 cycle for this instruction; 6 so far). PIC18F452
19 movlw high adjust PIC18F452
20 movlw high adjust Time is still passing (1 cycle for this instruction; 7 so far). PIC18F452
21 addwfc temph,f PIC18F452
22 addwfc temph,f Add the high bytes. (1 cycle for this instruction; 8 so far). PIC18F452
23 movff temph,tmr0h PIC18F452
24 movff temph,tmr0h Time is still passing (2 cycles for this instruction; 10 so far). PIC18F452
25 movff templ,tmr0l PIC18F452
26 movff templ,tmr0l Time is still passing (2 cycles for this instruction; 12 so far). PIC18F452
27 resynch delay When we rewrite the low byte, the timer will be updated... PIC18F452
28 resynch delay.. but there is a 2 cycle delay for the clock to resynch after re-loading. PIC18F452
29 resynch delay In total, there are 14 cycles used by the update, which must be subtracted from the desired interval. PIC18F452
30 resynch delay As above, these 14 cycles used by the update actually need to be added to the reload value. PIC18F452
31 resynch delay After the adjustment is complete, the timer flag must be cleared. PIC18F452
32 So, whether using polling or interrupts, after an overflow the timer has to be adjusted by a value of PIC18F452
33 So, whether using polling or interrupts, after an overflow the timer has to be adjusted by a value of d PIC18F452
34 So, whether using polling or interrupts, after an overflow the timer has to be adjusted by a value of d the number of counts in a 16 bit sequence, including zero PIC18F452
35 So, whether using polling or interrupts, after an overflow the timer has to be adjusted by a value of d the number of counts in a 16 bit sequence, including zero interval length (in clock cycles) PIC18F452
36 So, whether using polling or interrupts, after an overflow the timer has to be adjusted by a value of d the number of counts in a 16 bit sequence, including zero interval length (in clock cycles) (eg. d ) PIC18F452
37 So, whether using polling or interrupts, after an overflow the timer has to be adjusted by a value of d the number of counts in a 16 bit sequence, including zero interval length (in clock cycles) (eg. d ) + d 12 PIC18F452
38 So, whether using polling or interrupts, after an overflow the timer has to be adjusted by a value of d the number of counts in a 16 bit sequence, including zero interval length (in clock cycles) (eg. d ) + d 12 to allow for the time for the arithmetic PIC18F452
39 So, whether using polling or interrupts, after an overflow the timer has to be adjusted by a value of d the number of counts in a 16 bit sequence, including zero interval length (in clock cycles) (eg. d ) + d 12 to allow for the time for the arithmetic + 2 to allow for the time for clock resynch PIC18F452
40 So, whether using polling or interrupts, after an overflow the timer has to be adjusted by a value of d the number of counts in a 16 bit sequence, including zero interval length (in clock cycles) (eg. d ) + d 12 to allow for the time for the arithmetic + 2 to allow for the time for clock resynch and then the flag must be cleared for the next interval. PIC18F452
PIC18F452 Timer adjustment
Wilfrid Laurier University February 10, 2012 Here s a code fragment for the timer: Here s a code fragment for the timer: t i m e a d j equ d 65536 d 25000 +d 12 +2 movff TMR0L, templ ; read 16 b i t c
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