Z80A CTC Counter/Timer Channel CMOS Version DIP-28
The Z80A CTC four-channel counter/timer can be programmed by system software for a broad range of counting and timing applications. The four independently programmable channels of the CTC satisfy common microcomputer system requirements for event counting, interrupt and interval timing, and general clock rate generation.
Four independently programmable counter/timer channels, each with a readable downcounter and a selectable 16 or 256 prescaler. Down-counters are reloaded automatically at zero count
Three channels have zero count/timeout outputs capable of driving Darlington transistors
Selectable positive or negative trigger initiates timer operation
Standard Z80A family daisy-chain interrupt structure provides fully-vectored, prioritized interrupts without external logic. The CTC may also be used as an interrupt controller