NEC PD78058FY(A) - Manual (Page 429)

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CHAPTER 18 SERIAL INTERFACE CHANNEL 1
(5) Automatic transmit/receive interval time
When using the automatic transmit/receive function, the read/write operations from/to the internal buffer RAM
are 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 CPU
processing when using the automatic transmit/receive function by the internal clock, the interval depends on
the value which is set in the automatic transmit/receive interval specification register (ADTI) and the CPU
processing at the rising edge of the eighth serial clock. Whether it depends on the ADTI or not can be selected
by the setting of its bit 7 (ADTI7). When it is set to 0, the interval depends only on the CPU processing. When
it 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 the
interval may be longer than the value indicated in Table 18-3.
Figure 18-23. Automatic Transmit/Receive Interval Time
CSIIF1: Interrupt request flag
SCK1
SO1 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
CSIIF1
SI1 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
Interval