CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U12688EJ4V0UM00
293
(4) Transmit shift registers 0, 0L, 1, 1L (TXS0, TXS0L, TXS1, TXS1L)
TXSn are 9-bit shift registers for transmission processing and when transmission is enabled, transmission
operations are started (n = 0, 1) by writing of data to these registers.
When transmission is disabled, the values are disregarded even if writing is performed.
A transmission complete interrupt request (INTSTn) is generated in synchronization with the end of
transmission of 1 frame including TXS data.
During 16-bit access of these registers, specify TXS0 and TXS1, and during lower 8-bit access, specify TXS0L
and TXS1L.
TXS0 and TXS1 are write-only registers in 16-bit units, and TXS0L and TXS1L are write-only registers in 8-bit
units.
15
0
TXS0
Address
FFFFF0CCH
After reset
Undefined
14
0
13
0
12
0
11
0
10
0
9
0
8
TXED0
7
TXS07
6
TXS06
5
TXS05
4
TXS04
3
TXS03
2
TXS02
1
TXS01
0
TXS00
TXS0L
FFFFF0CEH
Undefined
7
TXS07
6
TXS06
5
TXS05
4
TXS04
3
TXS03
2
TXS02
1
TXS01
0
TXS00
15
0
TXS1
FFFFF0DCH
Undefined
14
0
13
0
12
0
11
0
10
0
9
0
8
TXED1
7
TXS17
6
TXS16
5
TXS15
4
TXS14
3
TXS13
2
TXS12
1
TXS11
0
TXS10
TXS1L
FFFFF0DEH
Undefined
7
TXS17
6
TXS16
5
TXS15
4
TXS14
3
TXS13
2
TXS12
1
TXS11
0
TXS10
Bit Position
Bit Name
Function
8
TXEDn
Transmit Extended Data
This is the expansion bit during transmission of 9-bit/character data.
7 to 0
TXSn7 to
TXSn0
(n = 0, 1)
Transmit Shifter
This writes transmission data.
Cautions 1. UARTn does not have a transmit buffer, so there is no interrupt request at the end of
transmission (to the buffer), and an interrupt request (INTSTn) is generated in
synchronization with the end of transmission of 1 frame of data.
2. If the UARTn registers are changed during transmission, UARTn operation is not
guaranteed.
Remark
n = 0, 1
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