Copyright © Siemens AG 2016. All rights reserved
312
ERTEC 200P-2 Manual
Technical data subject to change
Version 1.0
(nUARTCTS) modem status input.
That is, the bit is 1 when the modem
status input is 0.
1
Data_Set_Ready
0h
rh
(DSR) This bit is the complement of
the PrimeCell UART data set ready
(nUARTDSR) modem status input.
That is, the bit is 1 when the modem
status input is 0.
2
Data_Carrier_Detect
0h
rh
(DCD) This bit is the complement of
the PrimeCell UART data carrier de-
tect (nUARTTDCD) modem status
input. That is, the bit is 1 when the
modem status input is 0.
3
UART_Busy
0h
rh
(BUSY) If this bit is set to 1, the
PrimeCell UART is busy transmitting
data. This bit remain set until the com-
plete byte, including all the stop bits,
has been sent from the shift register.
This bit is set as soon as the transmit
FIFO becomes non-empty.
4
Receive_FIFO_Empty
1h
rh
(RXFE) The meaning of this bit de-
pends on the state of the FEN bit in
the UARTLCR_H register. If the FIFO
is disabled, this bit is set when the
receive holding register is empty. If the
FIFO is enabled, the RXFE bit is set
when the receive FIFO is empty.
5
Transmit_FIFO_Full
0h
rh
(TXFF) The meaning of this bit de-
pends on the state of the FEN bit in
the UARTLCR_H register. If the FIFO
is disabled, this bit is set when the
transmit holding register is full. If the
FIFO is enabled, the TXFF bit is set
when the transmit FIFO is full.
6
Receive_FIFO_Full
0h
rh
(RXFF) The meaning of this bit de-
pends on the state of the FEN bit in
the UARTLCR_H register. If the FIFO
is disabled, this bit is set when the
receive holding register is full. If the
FIFO is enabled, the RXFF bit is set
when the receive FIFO is full.
7
Transmit_FIFO_Empty
1h
rh
(TXFE) The meaning of this bit de-
pends on the state of the FEN bit in
the UARTLCR_H register. If the FIFO
is disabled, this bit is set when the
transmit holding register is empty. If
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