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(5) Transmit buffer register 0 (TXB0)
The TXB0 register is an 8-bit buffer register for setting transmit data.
When transmission is enabled (TXE0 bit = 1 in the ASIM0 register), the transmit operation is started by
writing data to TXB0 register.
When transmission is disabled (TXE0 bit = 0 in the ASIM0 register), even if data is written to TXB0 register,
the value is ignored.
The TXB0 register data is transferred to the transmit shift register, and a transmission completion interrupt
request (INTST0) is generated, synchronized with the completion of the transmission of one frame from the
transmit shift register. For information about the timing for generating this interrupt request, refer to 10.2.5 (2)
Transmission operation.
When TXBF0 bit = 1 in the ASIF0 register, writing must not be performed to TXB0 register.
This register can be read/written in 8-bit units.
7
6
TXB0
TXB7
TXB6
Bit position
Bit name
TXB7 to
7 to 0
TXB0
420
CHAPTER 10 SERIAL INTERFACE FUNCTION
5
4
3
TXB5
TXB4
TXB3
Writes transmit data.
User's Manual U14492EJ5V0UD
2
1
0
TXB2
TXB1
TXB0
Function
Address
Initial value
FFFFFA04H
FFH
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