UPD75518 NEC, UPD75518 Datasheet - Page 97

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

SB0 (SB1)
SO0 latch
SB0 (SB1)
RELT
(Master)
CMDT
(Master)
CMDD
CMDD
Caution Do not set the ACKT until the transfer is completed.
CMDT
RELD
RELD
SCK0
SCK0
RELT
ACKT
SIO0
SCK0
SIO0
Transfer start request
6
D2
Fig. 4-38 Operations of RELT, CMDT, RELD, and CMDD (Master)
Fig. 4-39 Operations of RELT, CMDT, RELD, and CMDD (Slave)
7
D1
8
D0
9
Fig. 4-40 Operation of ACKT
When set during this period
D7
1
D6
2
ACK
D1
7
D0
8
ACK signal is output during the first clock
cycle immediately after ACKT is set.
When address match is found
When address mismatch is found
Write to SIO0.
PD75518(A)
Transfer start request
97