NEC PD750008 - Manual (Page 184)

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µPD750008 USER'S MANUAL
Figure 5-64. Operation of ACKD (2/2)
(c) Clear timing for case where start of transfer is directed during BUSY
Figure 5-65. Operation of BSYE
SCK
SB0, SB1
BSYE
9
BUSY
8 7 6
ACK
When BSYE = 1 at this point When reset operation is executed during
this period and BSYE = 0 at the falling edge
of SCK
SIO
SCK
D2 D1 D0 SB0, SB1
ACKD
9
BUSY
8 7 6
D7 ACK
Transfer start request
D6
Transfer start