NXP Semiconductors /LPC18xx /USART0 /RS485CTRL

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Interpret as RS485CTRL

31 2827 2423 2019 1615 1211 87 43 0 0 0 0 0 0 0 0 00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (DISABLED)NMMEN 0 (ENABLED)RXDIS 0 (DISABLED)AADEN 0 (RESERVED)RESERVED 0 (DISABLED)DCTRL 0 (LOW)OINV 0 (RESERVED)RESERVED

RXDIS=ENABLED, OINV=LOW, DCTRL=DISABLED, AADEN=DISABLED, NMMEN=DISABLED

Description

RS-485/EIA-485 Control. Contains controls to configure various aspects of RS-485/EIA-485 modes.

Fields

NMMEN

NMM enable.

0 (DISABLED): Disabled. RS-485/EIA-485 Normal Multidrop Mode (NMM) is disabled.

1 (ENABLED): Enabled. RS-485/EIA-485 Normal Multidrop Mode (NMM) is enabled. In this mode, an address is detected when a received byte causes the USART to set the parity error and generate an interrupt.

RXDIS

Receiver enable.

0 (ENABLED): Enabled. The receiver is enabled.

1 (DISABLED): Disabled.The receiver is disabled.

AADEN

AAD enable

0 (DISABLED): Disabled. Auto Address Detect (AAD) is disabled.

1 (ENABLED): Enabled. Auto Address Detect (AAD) is enabled.

RESERVED

Reserved.

DCTRL

Direction control for DIR pin.

0 (DISABLED): Disabled. Disable Auto Direction Control.

1 (ENABLED): Enabled. Enable Auto Direction Control.

OINV

Direction control pin polarity. This bit reverses the polarity of the direction control signal on the DIR pin.

0 (LOW): Low. The direction control pin will be driven to logic 0 when the transmitter has data to be sent. It will be driven to logic 1 after the last bit of data has been transmitted.

1 (HIGH): High. The direction control pin will be driven to logic 1 when the transmitter has data to be sent. It will be driven to logic 0 after the last bit of data has been transmitted.

RESERVED

Reserved, user software should not write ones to reserved bits. The value read from a reserved bit is not defined.

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