Hey friends, I am trying to make a digital capacitance meter by using a HSC08 microcontroller chip (MC9S08QG8). Unfortunately this is one of those courses where one doesn't know anything because of lack of pre-requisites. Anyhow (enough complaining) what I have been trying to do is the following: Connect the 555 timer to the IRQ pin of the chip. The 555 timer circuit has the unknown Capacitor attached to it. Now I am trying to measure the number of signals over a 7.5s period. I understand that I need an interrupt service subroutine to count the number of signals for this duration. However I am not sure how to control the count timing. I have been trying to use a delay subroutine such that the IRQSC register is set for counting in cycle of that delay.