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Z8018010VSC Datasheet(PDF) 18 Page - Zilog, Inc. |
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Z8018010VSC Datasheet(HTML) 18 Page - Zilog, Inc. |
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18 / 85 page ![]() Z80180 Microprocessor Unit 12 PS014004-1106 Overview (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 Description A18/TOUT 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. CKA0/DREQ0 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. CKA1/TEND0 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. RXS/CTS1 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. |
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