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XR16C850CM-F Datasheet(PDF) 6 Page - Exar Corporation |
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XR16C850CM-F Datasheet(HTML) 6 Page - Exar Corporation |
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6 / 56 page  XR16C850 xr 2.97V TO 5.5V UART WITH 128-BYTE FIFO REV. 2.3.1 6 LPT2# 26 22 O Line Printer Port-2 Decode Logic Output (active low) - This pin functions as the PC standard LPT-2 printer port address decode logic output, see Table 1. During Intel Bus Mode, LPT2# becomes DDIS#/D12. MODEM OR SERIAL I/O INTERFACE TX 13 8 O Transmit Data or wireless infrared transmit data. This output is active low in normal standard serial interface operation (RS-232, RS-422 or RS-485) and active high in the infrared mode. Infrared mode can be enabled by connecting pin ENIR to VCC or through software selection after power up. RX 11 7 I Receive Data or wireless infrared receive data. Normal received data input idles at logic 1 condition and logic 0 in the infrared mode. The wireless infrared pulses are applied to the decoder. This input must be connected to its idle logic state in either normal, logic 1, or infrared mode, logic 0, else the receiver may report “receive break” and/or “error” condition(s). RTS# 36 32 O Request to Send or general purpose output (active low). This port may be used for automatic hardware flow control, see EFR bit-6, MCR bit-1, FCTR bits 0-1 and IER bit-6. RTS# output must be asserted before auto RTS flow control can start. If this pin is not needed for modem communication, then it can be used as a general I/O. If it is not used, leave it unconnected. CTS# 40 38 I Clear to Send or general purpose input (active low). If used for automatic hardware flow control, data transmission will be stopped when this pin is de-asserted and will resume when this pin is asserted again. See EFR bit-7, MCR bit-2 and IER bit-7. If this pin is not needed for modem communication, then it can be used as a general I/O. If it is not used, connect it to VCC. DTR# 37 33 O Data Terminal Ready or general purpose output (active low). If this pin is not needed for modem communication, then it can be used as a general I/O. If it is not used, leave it unconnected. DSR# 41 39 I Data Set Ready input or general purpose input (active low). If this pin is not needed for modem communication, then it can be used as a general I/O. If it is not used, connect it to VCC. CD# 42 40 I Carrier Detect input or general purpose input (active low). If this pin is not needed for modem communication, then it can be used as a general I/O. If it is not used, connect it to VCC. RI# 43 41 I Ring Indicator input or general purpose input (active low). If this pin is not needed for modem communication, then it can be used as a general I/O. If it is not used, connect it to VCC. ANCILLARY SIGNALS XTAL1 18 14 I Crystal or external clock input. See Figure 7 for typical oscillator connections. Caution: this input is not 5V tolerant. XTAL2 19 15 O Crystal or buffered clock output. See Figure 7 for typical oscillator connections. SEL 34 36 I PC Mode Select (active low). When this input is at logic 0, it enables the on-board chip select decode function according to PC ISA bus COM[4:1] and IRQ[4,3] port definitions. See Table 3 for details. This pin has an internal 100kΩ pull-up resistor. This pin is not available on the 40 pin PDIP packages which operate in the Intel Bus Mode only. NAME 44-PIN PLCC 48-PIN TQFP TYPE DESCRIPTION |
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