NEC V850ES/KE1+ User Manual page 452

(2) Usage (transmission/reception: 8-bit data length)
<1> Set the continuous transfer mode (CSIM0n.AUTOn bit = 1) and the transmission/reception mode
(CSIM0n.TRMDn bit = 1).
<2> Write the first data to the SOTBFnL register.
<3> Write the 2nd data to the SOTBnL register (start transfer).
<4> When the transmission/reception completion interrupt request signal (INTCSI0n) has been generated,
write the next data to the SOTBnL register (reserve next transfer). Read the SIRBnL register to load
the receive data.
<5> Repeat step <4> as long as data to be sent remains.
<6> When the INTCSI0n signal is generated, read the SIRBnL register to load the (N − 1)th receive data
(N: Number of transfer data).
<7> Following the last INTCSI0n signal, read the SIO0nL register to load the Nth (last) receive data.
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CHAPTER 15 CLOCKED SERIAL INTERFACE 0 (CSI0)
User's Manual U16896EJ2V0UD