Post by thread:16C58 TMR0

I am trying to use TMR0 to synchronize my code length, but when I simulate with the stopwatch running the STOPWATCH increments 2 cycles(exactly following single step mode) for every TMR0 cycle on average. I do not have the prescaler turned on. I initialize TMR0 with the following code: movlw b'00000000' option Any suggestions? Thanks, Greg.

On Wed, 17 Feb 1999 16:34:15 -0800 GregH <spam_OUTgregTakeThisOuTZIRCON.COM> writes: >I do not have the prescaler turned on. > >I initialize TMR0 with the following code: > >movlw b'00000000' >option This setting turns the prescaler on to the timer with a value of 2. If the PSA bit is 0, assigning the prescaler to the timer, the timer can run with prescale of 2, 4, 8, 16, 32, 64, 128, or 256. In order to use the timer without any prescaler, set the PSA bit to 1, assigning the prescaler to the WDT. If you want to keep the WDT time the same, set the other bits to 0 so WDT has a 1:1 prescale. Set OPTION to 00001000. ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com/getjuno.html or call Juno at (800) 654-JUNO [654-5866]

> movlw b'00000000' > option When TMR0 is assigned to the prescaler the minimum scale ratio is 1:2, that is why you are getting 2 'ticks' per tmr0 increment. The ratio is set 1:1 when the prescaler is assigned to the WDT. -- Best regards Tony Multimedia 16F84 Beginners PIC Tools. ** NEW PicNPro Programmer and Port Interface ** http://www.picnpoke.com Email .....picnpokeKILLspam@spam@cdi.com.au