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XR16V2550IM Datasheet(PDF) 4 Page - Exar Corporation |
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XR16V2550IM Datasheet(HTML) 4 Page - Exar Corporation |
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4 / 48 page  XR16V2550 PRELIMINARY 4 HIGH PERFORMANCE DUART WITH 16-BYTE FIFO REV. P1.0.0 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 6 5 I UART channel A Receive Data or infrared receive data. Normal receive data input must idle HIGH. 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], and IER[6]. 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. RXB 3 4 I UART channel B Receive Data or infrared receive data. Normal receive data input must idle HIGH. If this pin is not used, tie it to VCC or pull it high via a 100k ohm resistor. Pin Description NAME 32-QFN PIN # 48-TQFP PIN # TYPE DESCRIPTION |
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