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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(5)
Transmission buffer registers (TXB0, TXB1)
The TXBn register is an 8-bit buffer register for setting transmit data.
When transmission is enabled (TXE bit = 1 in the ASIMn register), the transmit operation is started
by writing data to TXBn register.
When transmission is disabled (TXE bit = 0 in the ASIMn register), even if data is written to TXBn
register, the value is ignored.
The TXBn register data is transferred to the transmission shift register, and a transmission
completion interrupt request (INTSTn) 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 13.2.5 (2)“Transmit operation” on page 376.
When TXBF bit = 1 in the ASIFn register, writing must not be performed to TXBn register.
This register can be read or written in 8-bit or 1-bit units (n = 0, 1).
Figure 13-6:
Transmission Buffer Registers (TXB0, TXB1)
7
6
5
4
3
2
1
0
Address
Initial
value
TXB0
TXB7
TXB6
TXB5
TXB4
TXB3
TXB2
TXB1
TXB0
FFFF FA04H
FFH
TXB1
TXB7
TXB6
TXB5
TXB4
TXB3
TXB2
TXB1
TXB0
FFFF FA44H
FFH
Bit Position
Bit Name
Function
7 to 0
TXB7 to
TXB0
Writes transmit data.
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