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Chapter 13
Serial Interface Function
Preliminary User’s Manual U15839EE1V0UM00
(3)
Continuous transmission operation
UART5n can write the next transmit data to the TXBn register at the time that the transmission
shift register starts the shift operation. This enables an efficient transmission rate to be realized by
continuously transmitting data even during the INTSTn interrupt service after the transmission of
one data frame.
When continuous transmission is performed, data should be written after referencing the ASIFn
register to confirm the transmission status and whether or not data can be written to the TXBn
register (n = 0, 1).
Caution:
Transmit data should be written when the TXBF bit is 0. The transmission unit should
be initialized when the TXSF bit is 0. If these actions are performed at other times, the
transmit data cannot be guaranteed.
Table 13-2:
Transmission Status and Whether or Not Writing Is Enabled
TXBF
TXSF
Transmission Status
Whether or not Write
Operation to TXBn is Enabled
0
0
Initial status or transmission completed
Writing is enabled
0
1
Transmission in progress (no data is in TXBn register)
Writing is enabled
1
0
Awaiting transmission (data is in TXBn register)
Writing is not enabled
1
1
Transmission in progress (data is in TXBn register)
Writing is not enabled
Содержание mPD703128
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