SC16IS850LIBS,128 NXP Semiconductors, SC16IS850LIBS,128 Datasheet - Page 33

• Manufacturer Part Number: SC16IS850LIBS,128
• Manufacturer: NXP Semiconductors

Specifications of SC16IS850LIBS,128

• Lead Free Status / Rohs Status: Compliant

NXP Semiconductors
SC16IS850L
Product data sheet
8.20 RS-485 Turn-around time delay (RS485TIME)
8.21 Advanced Feature Control Register 2 (AFCR2)
The value in this register controls the turn-around time of the external line transceiver in
bit time. In automatic 9-bit mode RTS or DTR pin is used to control the direction of the line
driver, after the last bit of data has been shifted out of the transmit shift register the UART
will count down the value in this register. When the count value reaches zero, the UART
will assert RTS or DTR pin (logic 0) to turn the external RS-485 transceiver around for
receiving.
Table 28.
Table 29.
Bit
7:0
Bit
7:6
5
4
2
1
0
3
Symbol
RS485TIME[7:0]
Symbol
AFCR2[7:6]
AFCR2[5]
AFCR2[4]
AFCR2[3]
AFCR2[2]
AFCR2[1]
AFCR2[0]
RS-485 programmable turn-around time register bits description
Advanced Feature Control Register 2 register bits description
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 22 July 2011
Description
reserved
RTSInvert. Invert RTS or DTR signal in automatic 9-bit mode.
RTSCon. Enable the transmitter to control RTS or DTR pin in
automatic 9-bit mode.
RS485 RTS/DTR. Select RTS or DTR pin to control the external
transceiver.
TXDisable. Disable transmitter
RXDisable. Disable receiver
9-bitMode. Enable 9-bit mode or Multidrop (RS-485) mode
logic 0 = RTS or DTR is set to 0 by the UART during transmission,
and to 1 during reception
logic 1 = RTS or DTR is set to 1 by the UART during transmission,
and to 0 during reception
logic 0 = transmitter does not control RTS or DTR pin
logic 1 = transmitter controls RTS or DTR pin
logic 0 = RTS pin is used to control the external transceiver
logic 1 = DTR pin is used to control the external transceiver
logic 0 = transmitter is enabled
logic 1 = transmitter is disabled
logic 0 = receiver is enabled
logic 1 = receiver is disabled
logic 0 = normal RS-232 mode
logic 1 = enable 9-bit mode
Description
External RS-485 transceiver turn-around time delay. The value
represents the bit time at the programmed baud rate.
Single UART with I
SC16IS850L
2
C-bus/SPI interface
© NXP B.V. 2011. All rights reserved.
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