A timer is a simple counter! The input clock of microcontroller and operation of the timer is independent of the program execution.All the Atmel microcontrollers have Timers as an inbuilt peripheral.
The PMC424 combines 40 I/O lines for TTL and differential signals with four 16-bit counter/timers and the PMC464 provides 64 TTL I/O lines plus four 16-bit timer/counters whose TTL- compatible ...
Two multifunction I/O modules feature both digital I/O and counter/timer functions on a single PMC module. The PMC424 provides 40 digital I/O channels for transistor-transistor logic (TTL) and ...