NEC PD75402A - Manual (Page 118)

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CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
Fig. 5-44 ACKT Operation
Note ACKT must not be set before the end of a transfer.
SCK
SB0
ACKT
When set in this interval
ACK signal is output in 1
clock interval immediately
after ACKT is set.
ACK D2 D1 D0
6 7 8 9