429CHAPTER 18 SERIAL INTERFACE CHANNEL 1(5) Automatic transmit/receive interval timeWhen using the automatic transmit/receive function, the read/write operations from/to the internal buffer RAMare performed after transmitting/receiving one byte. Therefore, an interval is inserted before the next transmit/receive.Since the read/write operations from/to the internal buffer RAM are performed in parallel with the CPUprocessing when using the automatic transmit/receive function by the internal clock, the interval depends onthe value which is set in the automatic transmit/receive interval specification register (ADTI) and the CPUprocessing at the rising edge of the eighth serial clock. Whether it depends on the ADTI or not can be selectedby the setting of its bit 7 (ADTI7). When it is set to 0, the interval depends only on the CPU processing. Whenit is set to 1, the interval depends on the contents of the ADTI or CPU processing, whichever is greater.When the automatic transmit/receive function is used by an external clock, it must be selected so that theinterval may be longer than the value indicated in Table 18-3.Figure 18-23. Automatic Transmit/Receive Interval TimeCSIIF1: Interrupt request flagSCK1SO1 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0CSIIF1SI1 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0Interval
