Programmable Timer Module (PTM) DIP-28
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Programmable Timer Module (PTM) DIP-28, Programmable Timer Module (PTM) DIP-28 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 Three masked outputs DIP-28