NEC UPD703116 User Manual page 426

Set registers
Write transmit data to
TXB0 register
When reading
No
ASIF0 register,
TXBF0 = 0?
Write 2nd byte of the
transmit data to TXB0
register
426
CHAPTER 10 SERIAL INTERFACE FUNCTION
Figure 10-4. Continuous Transmission Processing Flow
Yes
Interrupt occurrence
number of transfers
No
Write transmit data to
TXB0 register
Wait for interrupt
User's Manual U14492EJ5V0UD
Required
Yes
performed?
No
When reading
ASIF0 register,
TXSF0 = 1?
Yes
End of transmission
When reading
No
ASIF0 register,
TXSF0 = 0?
Yes
processing