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Bit
Name
Reset
Access
Description
7:4
Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
3:0
DATABITS
0x5
RW
Data-Bit Mode
This register sets the number of data bits in a USART frame.
Value
1
2
3
4
5
6
7
8
9
10
11
12
13
Mode
FOUR
FIVE
SIX
SEVEN
EIGHT
NINE
TEN
ELEVEN
TWELVE
THIRTEEN
FOURTEEN
FIFTEEN
SIXTEEN
Description
Each frame contains 4 data bits
Each frame contains 5 data bits
Each frame contains 6 data bits
Each frame contains 7 data bits
Each frame contains 8 data bits
Each frame contains 9 data bits
Each frame contains 10 data bits
Each frame contains 11 data bits
Each frame contains 12 data bits
Each frame contains 13 data bits
Each frame contains 14 data bits
Each frame contains 15 data bits
Each frame contains 16 data bits
16.5.3 USARTn_TRIGCTRL - USART Trigger Control register
Offset
0x008
Reset
Access
Name
Bit Position
Bit
Name
Reset
Access
Description
31:6
Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
5
TXTEN
0
RW
Transmit Trigger Enable
When set, the PRS channel selected by TSEL sets TXEN, enabling the transmitter on positive trigger edges.
4
RXTEN
0
RW
Receive Trigger Enable
When set, the PRS channel selected by TSEL sets RXEN, enabling the receiver on positive trigger edges.
3
Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
2:0
TSEL
0x0
RW
Trigger PRS Channel Select
Select USART PRS trigger channel. The PRS signal can enable RX and/or TX, depending on the setting of RXTEN and TXTEN.
Value
0
1
2
3
4
5
6
7
Mode
PRSCH0
PRSCH1
PRSCH2
PRSCH3
PRSCH4
PRSCH5
PRSCH6
PRSCH7
Description
PRS Channel 0 selected
PRS Channel 1 selected
PRS Channel 2 selected
PRS Channel 3 selected
PRS Channel 4 selected
PRS Channel 5 selected
PRS Channel 6 selected
PRS Channel 7 selected
2011-04-12 - d0001_Rev1.10
203
www.energymicro.com
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