CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U14492EJ3V0UD
457
(5) 2-frame continuous transmission shift registers 1, 2 (TXS1, TXS2)/transmission shift registers L1, L2
(TXSL1, TXSL2)
The TXSn register is a 9-bit/2-frame continuous transmission processing shift register (n = 1, 2).
Transmission is started by writing data to this register.
A transmission completion interrupt request (INTSTn) is generated in synchronization with the end of
transmission of 1 frame or 2 frames including the TXSn data.
For 16-bit access to this register, specify TXSn, and for access to the lower 8 bits, specify TXSLn.
The TXSn register is write-only in 16-bit units, and the TXSLn register is write-only in 8-bit units.
Caution
TXSn, TXSLn 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
Initial value
Undefined
2
TXS2
3
TXS3
4
TXS4
5
TXS5
6
TXS6
7
TXS7
1
TXS1
0
TXS0
TXSL1
[Transmission shift register L1]
Address
FFFFFA26H
Initial value
Undefined
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
TXS2
[2-frame continuous transmission shift register 2]
Address
FFFFFA44H
Initial value
Undefined
2
TXS2
3
TXS3
4
TXS4
5
TXS5
6
TXS6
7
TXS7
1
TXS1
0
TXS0
TXSL2
[Transmission shift register L2]
Address
FFFFFA46H
Initial value
Undefined
Bit Position
Bit Name
Function
15 to 0
TXB15 to
TXB0
Writes transmit data.
Содержание V850E/IA1 mPD703116
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