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XR17L154 Datasheet(PDF) 42 Page - Exar Corporation |
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XR17L154 Datasheet(HTML) 42 Page - Exar Corporation |
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42 / 56 page  áç áç áç áç XR17L154 3.3V PCI BUS QUAD UART DISCONTINUED REV. 1.1.0 42 FCTR [3:0] - Auto RTS/DTR Flow Control Hysteresis Select These bits select the auto RTS/DTR flow control hysteresis and only valid when TX and RX Trigger Table-D is selected (FCTR bit-6 and 7 are set to logic 1). The RTS/DTR hysteresis is referenced to the RX FIFO trigger level. After reset, these bits are set to logic 0 selecting the next FIFO trigger level for hardware flow control. Table 16 below shows the 16 selectable hysteresis levels. FCTR[4]: Infrared RX Input Logic Select • Logic 0 = Select RX input as active high encoded IrDA data, normal, (default). • Logic 1 = Select RX input as active low encoded IrDA data, inverted. FCTR[5]: Auto RS485 Enable Auto RS485 half duplex control enable/disable. • Logic 0 = Standard ST16C550 mode. Transmitter generates an interrupt when transmit holding register (THR) becomes empty. Transmit Shift Register (TSR) may still be shifting data bit out. • Logic 1 = Enable Auto RS485 half duplex direction control. RTS# output changes its logic level from 1 to 0 when finished sending the last stop bit of the last character out of the TSR register. It changes back to logic level 1 from 0 when a data byte is loaded into the THR or transmit FIFO. The change to logic 1 occurs prior sending the start-bit. It also changes the transmitter interrupt from transmit holding to transmit shift register (TSR) empty. TABLE 16: 16 SELECTABLE HYSTERESIS LEVELS WHEN TRIGGER TABLE-D IS SELECTED FCTR BIT-3 FCTR BIT-2 FCTR BIT-1 FCTR BIT-0 RTS/DTR HYSTERESIS (CHARACTERS) 00 00 0 00 01 +/- 4 00 10 +/- 6 00 11 +/- 8 01 00 +/- 8 01 01 +/- 16 01 10 +/- 24 01 11 +/- 32 11 00 +/- 12 11 01 +/- 20 11 10 +/- 28 11 11 +/- 36 10 00 +/- 40 10 01 +/- 44 10 10 +/- 48 10 11 +/- 52 |
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