ISD94100 Series Technical Reference Manual
Sep 9, 2019
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5.
Determine auto direction control by programming RS485AUD (UART_ALTCTL[10]).
Start
bit
D0
TX pin output
Driver Enable
RX
TX
nRTS
Differential Bus
RS- 485 Transceiver
UART / RS- 485 Controller
D1
D2
D3
D4
D5
D6
D7
P
Stop
bit
Driver Enable
RTSSTS
(UART_MODEM[13])
Note:
RS485AUD(UART_ALTCTL[10]) must be set to 1, and RTSACTLV(UART_MODEM[9]) must be set to
0.
Figure 6.12-17 Structure of RS-485 Frame
6.12.5.10 PDMA Transfer Function
UART controller supports PDMA transfer function.
By configuring PDMA parameter and set UART_DAT as the PDMA destination address. When
TXPDMAEN (UART_INTEN[14]) is set to 1, the controller will issue request to PDMA controller to
start the PDMA transmission process automatically.
By configuring PDMA parameter and set UART_DAT as the PDMA source address. When
RXPDMAEN (UART_INTEN[15]) is set to 1, the controller will start the PDMA reception process.
UART controller will issue request to PDMA controller automatically when there is data in the RX
FIFO buffer.
Note:
If STOPn (PDMA_STOP[n]) is set to stop UART RXPDMA task and the UART receive is not
finish. UART controller will complete the transfer and stored current receive data in receive buffer.
By reading RXEMPTY (UART_FIFOSTS[14]) to check there is valid data in receive buffer or not.
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