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XR16V2552IJ Datasheet(PDF) 4 Page - Exar Corporation |
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XR16V2552IJ Datasheet(HTML) 4 Page - Exar Corporation |
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4 / 48 page  XR16V2552 4 HIGH PERFORMANCE DUART WITH 16-BYTE FIFO REV. 1.0.2 RXA 24 39 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 MCR[2]. If this pin is not used, tie it to VCC or pull it high via a 100k ohm resistor. RTSA# 22 36 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 40 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 O UART channel A Data-Terminal-Ready (active low) or general purpose output. If this pin is not used, leave it unconnected. DSRA# - 41 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# - 42 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# - 43 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. MFA# - 35 O Multi-Function Output Channel A. This output pin can function as the OP2A#, BAUDOUTA#, or RXRDYA# pin. One of these output signal functions can be selected by the user programmable bits 1-2 of the Alternate Function Register (AFR). These signal functions are described as follows: 1) OP2A# - When OP2A# (active low) is selected, the MF# pin is LOW when MCR bit-3 is set to a logic 1 (see MCR bit-3). MCR bit-3 defaults to a logic 0 condition after a reset or power-up. 2) BAUDOUTA# - When BAUDOUTA# function is selected, the Baud rate clock output is available at this pin. 3) RXRDYA# - RXRDYA# (active low) is intended for monitoring block data transfers. See Table 2 for more details. TXB 16 26 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 15 25 I UART channel B 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 MCR[2]. If this pin is not used, tie it to VCC or pull it high via a 100k ohm resistor. RTSB# 13 23 O UART channel B Request-to-Send (active low) or general purpose out- put. This port must be asserted prior to using auto RTS flow control, see EFR[6], MCR[1], and IER[6]. Pin Description NAME 32-QFN PIN # 44-PLCC PIN # TYPE DESCRIPTION |
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