CHAPTER 10 SERIAL INTERFACE FUNCTION
User’s Manual U14492EJ3V0UD
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(5) Transmission 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 transmission shift register, and a transmission completion
interrupt request (INTST0) is generated, synchronized with the completion of the transmission of one frame
from the transmission 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
5
4
3
2
1
0
Address
Initial value
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.