ISD94100 Series Technical Reference Manual
Sep 9, 2019
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Rev1.09
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UART Function Select Register (UART_FUNCSEL)
Register
Offset
R/W Description
Reset Value
UART_FUNCSEL
U0x30
R/W UART Function Select Register
0x0000_0000
31
30
29
28
27
26
25
24
Reserved
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
Reserved
7
6
5
4
3
2
1
0
Reserved
TXRXDIS
Reserved
FUNCSEL
Bits
Description
[31:4]
Reserved
Reserved. Any values read should be ignored. When writing to this field always write with
reset value.
[3]
TXRXDIS
TX and RX Disable Bit
Setting this bit can disable TX and RX.
0 = TX and RX Enabled.
1 = TX and RX Disabled.
Note:
The TX and RX will not disable immediately when this bit is set. The TX and RX
completed current task before disable TX and RX. When TX and RX disable, the TXRXACT
(UART_FIFOSTS[31]) is cleared.
[2]
Reserved
Reserved. Any values read should be ignored. When writing to this field always write with
reset value.
[1:0]
FUNCSEL
Function Select
00 = UART function.
11 = RS-485 function.
Others = Reserved. Do not use.