NEC 78K0/KB1+ Preliminary User's Manual page 248

Figure 12-16 shows an example of the continuous transmission processing flow.
Figure 12-16. Example of Continuous Transmission Processing Flow
Remark TXB6:
ASIF6: Asynchronous serial interface transmission status register 6
TXBF6: Bit 1 of ASIF6 (transmit buffer data flag)
TXSF6: Bit 0 of ASIF6 (transmit shift register data flag)
248
CHAPTER 12 SERIAL INTERFACE UART6
Set registers.
Write TXB6.
Transfer
executed necessary
number of times?
No
Read ASIF6
TXBF6 = 0?
Yes
Write TXB6.
Transmission
completion interrupt
occurs?
Yes
Transfer
executed necessary
number of times?
No
Transmit buffer register 6
Preliminary User's Manual U16846EJ1V0UD
Yes
No
No
Yes
Read ASIF6
TXSF6 = 0?
Yes
Yes
Completion of
transmission processing
No