Z801806PSC Просмотр технического описания (PDF) - Zilog

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Z801806PSC

Microprocessor Unit

Zilog 

Z80180

Microprocessor Unit

12

(see DC Characteristics on page 21). Several pins are used for different conditions,

depending on the circumstance.

Multiplexed Pin Descriptions

Table 4. Multiplexed Pin Descriptions

Pin

A18/TOUT

CKA0/DREQ0

CKA1/TEND0

RXS/CTS1

Description

During RESET, this pin is initialized as A18 pin. If either TOC1 or TOC0

bit of the Timer Control Register (TCR) is set to 1, TOUT function is

selected. If TOC1 and TOC0 are cleared to 0, A18 function is selected.

During RESET, this pin is initialized as CKA0 pin. If either DM1 or SM1

in DMA Mode Register (DMODE) is set to 1, DREQ0 function is always

selected.

During RESET, this pin is initialized as CKA1 pin. If CKA1D bit in ASCI

control register ch1 (CNTLA1) is set to 1, TEND0 function is selected. If

CKA1D bit is set to 0, CKA1 function is selected.

During RESET, this pin is initialized as RXS pin. If CTS1E bit in ASCI

status register ch1 (STAT1) is set to 1, CTS1 function is selected. If

CTS1E bit is set to 0, RXS function is selected.

PS014004-1106

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