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XR16C2850 Datasheet(PDF) 4 Page - Exar Corporation |
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XR16C2850 Datasheet(HTML) 4 Page - Exar Corporation |
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4 / 51 page  XR16C2850 xr 2.97V TO 5.5V DUAL UART WITH 128-BYTE FIFOS REV. 2.1.3 4 RXRDYB# 23 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 this output is not used, leave it unconnected. MODEM OR SERIAL I/O INTERFACE TXA 13 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 isLOW. If this output is not used, leave it uncon- nected. RXA 11 5 I UART channel A Receive Data or infrared receive data. Normal receive data input must idle HIGH. The infrared receiver pulses typically idles 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# 36 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]. If this output is not used, leave it unconnected. CTSA# 40 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# 37 34 O UART channel A Data-Terminal-Ready (active low) or general purpose output. If this output is not used, leave it unconnected. DSRA# 41 39 I UART channel A Data-Set-Ready (active low) or general purpose input. This input should be connected to VCC when not used. CDA# 42 40 I UART channel A Carrier-Detect (active low) or general purpose input. This input should be connected to VCC when not used. RIA# 43 41 I UART channel A Ring-Indicator (active low) or general purpose input. This input should be connected to VCC when not used. OP2A# 35 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 is LOW when MCR[3] is set to a logic 1. INTA is set to the three state mode and OP2A# is HIGH when MCR[3] is set to a logic 0. See MCR[3]. This output can only be used as a general pur- pose output when interrupts are not used, otherwise it will disturb the INTA output functionality. If this output is not used, leave it uncon- nected. TXB 14 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 this output is not used, leave it uncon- nected. NAME 44-PLCC PIN # 48-TQFP PIN # TYPE DESCRIPTION |
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