UPD75518 NEC, UPD75518 Datasheet - Page 99

• Manufacturer Part Number: UPD75518
• Description: 4 BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

(a) When ACK signal is output during ninth SCK0 clock
(b) When ACK signal is output after ninth SCK0 clock
(c) Clear timing for case where start of transfer is requested during BUSY
SB0/SB1
SB0/SB1
SB0/SB1
SB0/SB1
ACKD
ACKD
ACKD
SCK0
BSYE
SCK0
SCK0
SCK0
SIO0
SIO0
SIO0
6
6
6
6
D2
D2
D2
7
7
7
7
D1
D1
D1
8
8
8
8
D0
D0
D0
When BSYE = 1 at this point
9
9
9
9
ACK
Fig. 4-42 Operation of ACKD
Fig. 4-43 Operation of BSYE
ACK
Transfer start request
ACK
ACK
Transfer start
BUSY
BUSY
Transfer start request
When reset operation is executed during
this period and BSYE = 0 at the falling edge
of SCK0.
Transfer start request
D7
Transfer start
PD75518(A)
D6
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