I was designing a circuit to determine frequency of signals using a counter as the main part of the circuit. However, I was just informed that period must also be measured or have the circuit perform one of the other. Are there ICs that are able to determine the period between rising edges? If so, I will be able to use transistors to multiplex between frequency or period measurement. The microcontroller I will be using is the motorola HS12. I know there are some ports on the HS12 that can be used for input-capture. The period could easily be found using these ports. Can these ports also be configured for pulse accumulation?