Hi! I am working on a pulse meter I want to use a 16f84 or 16f627-628 Supouse that the normal pulse is beetwen min.0 and max.240 So in that case i have a frequency beetwen 0-4 pulse/sec. How can i measure the time beetwen 2 pulses using the rb0/int interrupt and 4MHz clock. I need to have a number beetwen 0-240 after to interrupts Have anyone some ideas? regards Kajcsa Laszlo and happy new year -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu