UPD75238GJ NEC [NEC], UPD75238GJ Datasheet - Page 95
UPD75238GJ
Manufacturer Part Number
UPD75238GJ
Description
4 BIT SINGLE-CHIP MICROCOMPUTER
Manufacturer
NEC [NEC]
Datasheet
1.UPD75238GJ.pdf
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(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 directed 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. 4-47 Operation of ACKD
Fig. 4-48 Operation of BSYE
ACK
Transfer operation start specification
ACK
ACK
BUSY
BUSY
Transfer operation start
Transfer operation start specification
When reset operation is executed during
this period and BSYE = 0 at the falling edge
of SCK0.
Transfer operation start specification
D7
Transfer operation start
D6
PD75238
95
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