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UM10503
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User manual
Rev. 2.1 — 10 December 2015
1169 of 1441
NXP Semiconductors
UM10503
Chapter 41: LPC43xx/LPC43Sxx UART1
41.6.15 UART1 RS-485 Address Match register
The RS485ADRMATCH register contains the address match value for RS-485/EIA-485
mode.
41.6.16 UART1 RS-485 Delay value register
The user may program the 8-bit RS485DLY register with a delay between the last stop bit
leaving the TXFIFO and the de-assertion of RTS (or DTR). This delay time is in periods of
the baud clock. Any delay time from 0 to 255 bit times may be programmed.
41.6.17 UART1 Transmit Enable Register
In addition to being equipped with full hardware flow control (auto-cts and auto-rts
mechanisms described above), TER enables implementation of software flow control, too.
When TXEN=1, UART1 transmitter will keep sending data as long as they are available.
As soon as TXEN becomes 0, UART1 transmission will stop.
4
DCTRL
Direction control enable.
0
0
Disabled. Disable Auto Direction Control.
1
Enabled. Enable Auto Direction Control.
5
OINV
Polarity.
This bit reverses the polarity of the direction control signal on the RTS (or DTR) pin.
0
0
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. 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.
31:6
-
-
Reserved, user software should not write ones to reserved bits. The value read
from a reserved bit is not defined.
NA
Table 967: UART1 RS485 Control register (RS485CTRL - address 0x4008 204C) bit description
Bit
Symbol
Value Description
Reset value
Table 968. UART1 RS485 Address Match register (RS485ADRMATCH - address 0x4008 2050) bit description
Bit
Symbol
Description
Reset value
7:0
ADRMATCH
Contains the address match value.
0x00
31:8
-
Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NA
Table 969. UART1 RS485 Delay value register (RS485DLY - address 0x4008 2054) bit description
Bit
Symbol
Description
Reset value
7:0
DLY
Contains the direction control (RTS or DTR) delay value. This register works in
conjunction with an 8-bit counter.
0x00
31:8
-
Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NA