CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U15195EJ5V0UD
450
(5) 2-frame continuous transmission shift register 1 (TXS1)/transmit shift register L1 (TXSL1)
The TXS1 register is a 9-bit/2-frame continuous transmission processing shift register. Transmission is
started by writing data to this register.
A transmission completion interrupt request (INTST1) is generated in synchronization with the end of
transmission of 1 frame or 2 frames including the TXS1 data.
For 16-bit access to this register, specify TXS1, and for access to the lower 8 bits, specify TXSL1.
The TXS1 register is write-only in 16-bit units, and the TXSL1 register is write-only in 8-bit units.
Caution TXS1, TXSL1 can be read, but since shifting is done in synchronization with the shift clock,
the data that is read cannot be guaranteed.
14
TXS14
13
TXS13
12
TXS12
2
TXS2
3
TXS3
4
TXS4
5
TXS5
6
TXS6
7
TXS7
8
TXS8
9
TXS9
10
TXS10
11
TXS11
15
TXS15
1
TXS1
0
TXS0
TXS1
[2-frame continuous transmission shift register 1]
Address
FFFFFA24H
After reset
Undefined
2
TXS2
3
TXS3
4
TXS4
5
TXS5
6
TXS6
7
TXS7
1
TXS1
0
TXS0
TXSL1
[Transmit shift register L1]
Address
FFFFFA26H
After reset
Undefined
Bit position
Bit name
Function
15 to 0
TXB15 to
TXB0
Write transmit data.