Designed to provide variable system time intervals, the MC6840 has three 16-bit binary counters, three corresponding control registers, and a status register.
Features
Operates from a single 5V power supply
Fully TTL-compatible
Single system clock required (enable)
Selectable pre-scaler on timer 3 capable of 8 MHz
Programmable interrupts (IRQ) output to MPU
Readable down counter indicated counts to go until time-out
Selectable gating for frequency or pulse-width comparison
Three asynchronous external clock and gate trigger inputs internally synchronized