To count 30 KHz, the PIC needs to run atleast 10 times faster for 16bit counting ( software overhead ). The PIC needs to run at 300 KHz, which is not LP mode and will consume power in any other mode. Antonio L Benci wrote: > Why not break up the duties between 3 12C509 (two counters each), add > an > SPI/3wire interface to each, MChip provides code for such and use a > 16F84 as the main brain... > > Nino. > -- > ****************************************************** > * Antonio (Nino) Benci * > * Electronic Services Manager * > * Monash University - Dept of Physics * > * Wellington Rd, Clayton. 3168 * > * Victoria, Australia. * > * TEL - 61 3 9905 3649, FAX - 61 3 9905 3637 * > * Mobile - 0414 764 763 (private and ah only) * > * EMAIL - nino.benci@sci.monash.edu.au (work) * > * - fleatech@excite.com (private) * > * WWW - www.physics.monash.edu.au/ * > ****************************************************** Chip Technologies Microchip Design Consultant No. 70, 9th Main Road, Mathikere, Bangalore - 560 054. INDIA Tel : +91-80-3362807 Fax : +91-80-3369451 Email : chiptech@vsnl.com Webpage : http://business.vsnl.com/chiptech