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W83787IF Datasheet(PDF) 5 Page - Winbond |
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W83787IF Datasheet(HTML) 5 Page - Winbond |
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5 / 123 page  W83787IF Publication Release Date:Sep 1995 - 5 - Revision A1 1.2 Serial Port Interface SYMBOL PIN I/O FUNCTION CTSA CTSB 34 47 I Clear To Send is the modem control input. The function of these pins can be tested by reading Bit 4 of the handshake status register. DSRA DSRB 33 48 I Data Set Ready. An active low indicates the modem or data set is ready to establish a communication link and transfer data to the UART. DCDA DCDB 32 49 I Data Carrier Detect. An active low indicates the modem or data set has detected a data carrier. RIA RIB 31 50 I Ring Indicator. An active low indicates that a ring signal is being received by the modem or data set. SINA SINB IRRX1 30 42 I Serial Input. Used to receive serial data from the communication link. SINB can be programmed by CR0D register as input pin IRRX1 for serial infrared communication SOUTA HURAS1 38 I/O UART A Serial Output. Used to transmit serial data out to the communication link. During power-on reset, this pin is pulled up internally and is defined as HURAS1, which is used for selecting the I/O address of the UART A. (See Table 1-2.) SOUTB HURBS1 IRTX1 43 I/O O UART B Serial Output. Used to transmit serial data out to the communication link. SOUTB can be programmed by CR0D register as output pin IRTX1 for serial infrared communication. During power-on reset, this pin is pulled up internally and is defined as HURBS1, which is used for selecting the I/O address of UARTB. (See Table 1-2.) DTRA HPRTAS0 35 I/O UART A Data Terminal Ready. An active low informs the modem or data set that the controller is ready to communicate. During power-on reset, this pin is pulled down internally and is defined as HPRTAS0. It is used for selecting the address of the parallel port. (See Table 1-3.) DTRB HURAS0 46 I/O UART B Data Terminal Ready. An active low informs the modem or data set that controller is ready to communicate. During power-on reset, this pin is pulled down internally and is defined as HURAS0. It is used for setting the I/O address of UART A. (See Table 1-2.) |
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