NEC PD75402A - Manual (Page 120)

109
CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
Fig. 5-46 ACKD Operation
(a) When ACK signal is output in 9th SCK clock interval
(b) When ACK signal is output after 9th SCK clock interval
6
Transfer Start Directive
Start of
Transfer
SIO
SCK
SB0
ACKD
7 8 9
D2 D1 D0
ACK
(c) Clearing timing when transfer start directive is given during busy state
Transfer Start Directive
Start of Transfer
SIO
SCK
SB0
ACKD
ACK D0 D2 D1
7 8 9 6
Fig. 5-47 BSYE Operation
SIO
SCK
SB0
ACKD
D2 D1 D0
6 7 8 9
ACK BUSY
D7 D6
Start of Transfer
Transfer Start Directive
SCK
SB0
BSYE
6 7 8 9
D2 D1 D0 ACK BUSY
When BSYE = 1 at
this Point When BSYE is Reset in this
Interval and BSYE = 0 when
SCK Falls
★