Zilog Z08470 Manual do Utilizador descarregar pdf (Página 19)

UM008101-0601 Counter/Timer Channels

Counter/Timer Channels

CTC FEATURES

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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

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Selectable positive or negative trigger initiates timer operation

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Three channels have zero count/timeout outputs capable of driving

Darlington transistors

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NMOS version for high-cost performance solutions

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CMOS version for the designs requiring low power consumption

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NMOS Z0843004 - 4 MHz, Z0843006 - 6.17 MHz

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CMOS Z84C3006 - dc to 6.17 MHz, Z84C3008 dc to 8 MHz,

Z84C3010 - dc to 10 MHz

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Interfaces directly to the Z80 CPU. Interfaces to the Z80 SIO for baud

rate generation

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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

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Zilog Z08470 Manual do Utilizador Página 19