CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U15195EJ5V0UD
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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)
Transmit operation
.
When TXBF0 bit = 1 in the ASIF0 register, writing must not be performed to TXB0 register.
This register can be read or written in 8-bit units.
7 6 5 4 3 2 1 0
Address
After
reset
TXB0 TXB7 TXB6 TXB5 TXB4 TXB3 TXB2 TXB1 TXB0
FFFFFA04H FFH
Bit position
Bit name
Function
7 to 0
TXB7 to
TXB0
Writes transmit data.
