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FDC37C669 数据表(PDF) 9 Page - SMSC Corporation |
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FDC37C669 数据表(HTML) 9 Page - SMSC Corporation |
9 / 164 page 9 DESCRIPTION OF PIN FUNCTIONS QFP/ TQFP PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 89 Transmit Data 2 TXD2/IRTX O24 Transmit serial data output for port 2. IR transmit data. 78 Receive Data 1 RXD1 I Reciever serial data input for port 1. 79 Transmit Data 1 TXD1 024 Transmit serial data output for port 1. 81,91 nRequest to Send (System Option) nRTS1 nRTS2 (SYSOPT) O4 Active low Request to Send outputs for the Serial Port. Handshake output signal notifies modem that the UART is ready to transmit data. This signal can be programmed by writing to bit 1 of Modem Control Register (MCR). The hardware reset will reset the nRTS signal to inactive mode (high). Forced inactive during loop mode operation. At the trailing edge of hardware reset, the nRTS2 input is latched to determine the configuration base address. 0 : INDEX Base I/O Address = 3F0 Hex 1 : INDEX Base I/O Address = 370 Hex 83,93 nData Terminal Ready nDTR1 nDTR2 O4 Active low Data Terminal Ready outputs for the serial port. Handshake output signal notifies modem that the UART is ready to establish data communication link. This signal can be programmed by writing to bit 0 of Modem Control Register (MCR). The hardware reset will reset the nDTR signal to inactive mode (high). Forced inactive during loop mode operation. |
类似零件编号 - FDC37C669 |
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类似说明 - FDC37C669 |
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