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PC87373 数据表(PDF) 17 Page - National Semiconductor (TI) |
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PC87373 数据表(HTML) 17 Page - National Semiconductor (TI) |
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17 / 174 page  1.0 Signal/Pin Connection and Description (Continued) 17 www.national.com Revision 1.1 1.4.2 Serial Port 1 and Serial Port 2 (UART1 and UART2) Signal Pin(s) I/O Buffer Type Power Well Description CTS1 CTS2 28 126 IINTS VDD3 Clear to Send. When low, indicates that the modem or other data transfer device is ready to exchange data. DCD1 DCD2 23 128 IINTS VDD3 Data Carrier Detected. When low, indicates that the modem or other data transfer device has detected the data carrier. DSR1 DSR2 24 124 IINTS VDD3 Data Set Ready. When low, indicates that the data transfer device, e.g., modem, is ready to establish a communications link. DTR_BOUT1 DTR_BOUT2 30 127 OO4/8 VDD3 Data Terminal Ready. When low, indicates to the modem or other data transfer device that the UART is ready to establish a communications link. After a system reset, these pins provide the DTR function and set these signals to inactive high. Loopback operation holds them inactive. Baud Output. Provides the associated serial channel baud rate generator output signal if test mode is selected, i.e., bit 7 of EXCR1 register is set. RI1 RI2 32 119 IINTS VDD3 Ring Indicator. When low, indicates that a telephone ring signal was received by the modem. These pins are monitored during VDD power-off for wake-up event detection. RTS1 RTS2 26 125 OO4/8 VDD3 Request to Send. When low, indicates to the modem or other data transfer device that the corresponding UART is ready to exchange data. A system reset sets these signals to inactive high, and loopback operation holds them inactive. SIN1 SIN2 25 121 IINTS VDD3 Serial Input. Receives composite serial data from the communications link (peripheral device, modem or other data transfer device). SOUT 27 O O4/8 VDD3 Serial Output. Sends composite serial data to the communications link (peripheral device, modem or other data transfer device). These signals are set active high after a system reset. SOUT2 122 O6/12 |
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