CHAPTER 11 SERIAL INTERFACE FUNCTION
User’s Manual U15109EJ3V0UD
368
(ii) In case of contention between interrupt request and register access
Since continuous transfer has stopped once, the transfer is executed as a new repeat transfer.
In the slave mode, a bit phase error transfer error results (refer to
Figure 11-20
).
In the transmit/receive mode, the value of the SOTBFn register is retransmitted, and illegal data is
sent.
Figure 11-20. Interrupt Request and Register Access Contention
SCKn
(I/O)
INTCSIn
interrupt
rq_clr
Reg_R/W
Transfer reservation period
0
1
2
3
4
Remarks 1.
n = 5, 6
2.
rq_clr:
Internal signal. Transfer request clear signal.
Reg_R/W: Internal signal. This signal indicates that receive data buffer register (SIRBn/SIRBLn)
read or transmit data buffer register (SOTBn/SOTBLn) write was performed.