CHAPTER 14 SERIAL INTERFACE CHANNEL 1285User’s Manual U11302EJ4V0UMIn 6-byte transmission (ARLD = 0, RE = 0) in basic transmission mode, buffer RAM operates asfollows.(i) Before transmission (refer to Figure 14-13 (a))After arbitrary data has been written to serial I/O shift register 1 (SIO1) (start trigger: this datais not transferred), transmit data 1 (T1) is transferred from the buffer RAM to SIO1. Whentransmission of the first byte is completed, the automatic data transmit/receive address pointer(ADTP) is decremented. Then transmit data 2 (T2) is transferred from the buffer RAM to SIO1.(ii) 4th byte transmission point (refer to Figure 14-13 (b))Transmission of the third byte is completed, and transmit data 4 (T4) is transferred from the bufferRAM to SIO1. When transmission of the fourth byte is completed, ADTP is decremented.(iii) Completion of transmission (refer to Figure 14-13 (c))When transmission of the sixth byte is completed, the interrupt request flag (CSIIF1) is set(INTCSI1 generation).Figure 14-13. Buffer RAM Operation in 6-Byte Transmission (in Basic Transmission Mode) (1/2)(a) Before transmissionTransmit data 1 (T1)Transmit data 2 (T2)Transmit data 3 (T3)Transmit data 4 (T4)Transmit data 5 (T5)Transmit data 6 (T6)FAFFHFAC5HFAC0HSIO10 CSIIF15 ADTP—1
