Z80 Datasheet, PDF (19/330 Pages) Zilog, Inc. – Z80 CPU PERIPHERALS

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Counter/Timer Channels
CTC FEATURES
• Four independently programmable counter/timer channels (CTC),
each with a readable down-counter and a selectable 16 or 256
prescaler. Down-counters are reloaded automatically at zero count
• Selectable positive or negative trigger initiates timer operation
• Three channels have zero count/timeout outputs capable of driving
Darlington transistors
• NMOS version for high-cost performance solutions
• CMOS version for the designs requiring low power consumption
• NMOS Z0843004 - 4 MHz, Z0843006 - 6.17 MHz
• CMOS Z84C3006 - dc to 6.17 MHz, Z84C3008 dc to 8 MHz,
Z84C3010 - dc to 10 MHz
• Interfaces directly to the Z80 CPU. Interfaces to the Z80 SIO for baud
rate generation
• Standard Z80 Family daisy-chain interrupt structure provides fully
vectored, prioritized interrupts without external logic. The CTC may
also be used as an interrupt controller
• A 6 MHz version supports 6.144 MHz CPU clock operation
CTC General Description
The Z80 CTC is a four-channel counter/timer that can be programmed by
system software for a broad range of counting and timing applications.
These four independently programmable channels satisfy common
UM008101-0601
Counter/Timer Channels