SC16C852LIB datasheet(37/60 Pages) PHILIPS

37 / 60 page

SC16C852L_2

Product data sheet

Rev. 02 — 25 January 2007

37 of 60

NXP Semiconductors

SC16C852L

1.8 V dual UART with 128-byte FIFOs and IrDA encoder/decoder

7.20 RS-485 Turn-around Time Delay (RS485TIME)

The value in this register controls the turn-around time of the external line transceiver in

bit time. In automatic 9-bit mode RTSA/RTSB or DTRA/DTRB 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

zero, the UART will assert RTSA/RTSB or DTRA/DTRB pin (logic 0) to turn the external

RS-485 transceiver around for receiving.

7.21 Advanced Feature Control Register 2 (AFCR2)

Table 32.

RS-485 programmable turn-around time register bits description

Bit

Symbol

Description

7:0

RS485TIME[7:0]

External RS-485 transceiver turn-around time delay. The value

represents the bit time at the programmed baud rate.

Table 33.

Advanced Feature Control Register 2 register bits description

Bit

Symbol

Description

7:6

AFCR2[7:6]

reserved

AFCR2[5]

RTSInvert. Invert RTS or DTR signal in automatic 9-bit mode.

logic

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

AFCR2[4]

RTSCon. Enable the transmitter to control RTSx or DTRx pin in

automatic 9-bit mode.

logic

logic 0 = transmitter does not control RTSx or DTRx pin

logic 1 = transmitter controls RTSx or DTRx pin

AFCR2[3]

RS485 RTS/DTR. Select RTSx or DTRx pin to control the external

transceiver.

logic

logic 0 = RTSx pin is used to control the external transceiver

logic 1 = DTRx pin is used to control the external transceiver

AFCR2[2]

TXDisable. Disable transmitter

logic 0 = transmitter is enabled

logic 1 = transmitter is disable

AFCR2[1]

RXDisable. Disable receiver

logic 0 = receiver is enabled

logic 1 = receiver is disable

AFCR2[0]

9-bitMode. Enable 9-bit mode or Multidrop (RS-485) mode

logic

logic 0 = normal RS-232 mode

logic 1 = enable 9-bit mode

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