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XR16V2750IM Datasheet(PDF) 4 Page - Exar Corporation |
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XR16V2750IM Datasheet(HTML) 4 Page - Exar Corporation |
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4 / 52 page  XR16V2750 4 HIGH PERFORMANCE DUART WITH 64-BYTE FIFO REV. 1.0.3 RXRDYB# - 18 O UART channel B Receiver Ready (active low). This output provides the RX FIFO/RHR status for receive channel B. See Table 2. If it is not used, leave it unconnected. MODEM OR SERIAL I/O INTERFACE TXA 5 7 O UART channel A Transmit Data or infrared encoder data. Standard transmit and receive interface is enabled when MCR[6] = 0. In this mode, the TX signal will be HIGH during reset or idle (no data). Infrared IrDA transmit and receive interface is enabled when MCR[6] = 1. In the Infrared mode, the inactive state (no data) for the Infrared encoder/ decoder interface is LOW. If it is not used, leave it unconnected. RXA 4 5 I UART channel A Receive Data or infrared receive data. Normal receive data input must idle HIGH. The infrared receiver pulses typically idles at LOW but can be inverted by software control prior going in to the decoder, see MCR[6] and FCTR[2]. If this pin is not used, tie it to VCC or pull it high via a 100k ohm resistor. RTSA# 23 33 O UART channel A Request-to-Send (active low) or general purpose out- put. This output must be asserted prior to using auto RTS flow control, see EFR[6], MCR[1], FCTR[1:0], EMSR[5:4] and IER[6]. For auto RS485 half-duplex direction control, see FCTR[3] and EMSR[3]. CTSA# 25 38 I UART channel A Clear-to-Send (active low) or general purpose input. It can be used for auto CTS flow control, see EFR[7], and IER[7]. This input should be connected to VCC when not used. DTRA# - 34 O UART channel A Data-Terminal-Ready (active low) or general purpose output. If it is not used, leave it unconnected. DSRA# - 39 I UART channel A Data-Set-Ready (active low) or general purpose input. This input should be connected to VCC when not used. This input has no effect on the UART. CDA# - 40 I UART channel A Carrier-Detect (active low) or general purpose input. This input should be connected to VCC when not used. This input has no effect on the UART. RIA# - 41 I UART channel A Ring-Indicator (active low) or general purpose input. This input should be connected to VCC when not used. This input has no effect on the UART. OP2A# - 32 O Output Port 2 Channel A - The output state is defined by the user and through the software setting of MCR[3]. INTA is set to the active mode and OP2A# output LOW when MCR[3] is set to a logic 1. INTA is set to the three state mode and OP2A# output HIGH when MCR[3] is set to a logic 0. See MCR[3]. If INTA is used, this output should not be used as a general output else it will disturb the INTA output functionality. TXB 6 8 O UART channel B Transmit Data or infrared encoder data. Standard transmit and receive interface is enabled when MCR[6] = 0. In this mode, the TX signal will be HIGH during reset or idle (no data). Infrared IrDA transmit and receive interface is enabled when MCR[6] = 1. In the Infrared mode, the inactive state (no data) for the Infrared encoder/ decoder interface is LOW. If it is not used, leave it unconnected. Pin Description NAME 32-QFN PIN # 48-TQFP PIN # TYPE DESCRIPTION |
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