Yeah, it seems to me you count clock cycles until you get an interrupt, then subtract that number from 255. That will give you the starting count of TMR0. Regards, Jim > -------- Original Message -------- > Subject: [PIC] Timer0 prescaler > From: David C Brown > Date: Thu, October 13, 2016 2:08 pm > To: "Microcontroller discussion list - Public." >=20 >=20 > ISTR an application showing how you could deduce the value in this regist= er > (mid range PICS such as 'F88) but cannot find it now. Anyone help? >=20 > --=20 > __________________________________________ > David C Brown > 43 Bings Road > Whaley Bridge > High Peak Phone: 01663 733236 > Derbyshire eMail: dcb.home@gmail.com > SK23 7ND web: www.bings-knowle.co.uk/dcb > >=20 >=20 >=20 > *Sent from my etch-a-sketch* > --=20 > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .