NEC 78014Y Series User Manual page 308

Master Device Processing (Receiver)
Program Processing
Hardware Operation
Transfer Line
SCK0 Pin
SB0 (SB1) Pin
BUSY
Slave Device Processing (Transmitter)
Write to
Program Processing
SIO0
BUSY
Hardware Operation
Clear
Figure 15-31. Data Transmission from Slave Device to Master Device
FFH Write
to SIO0
SCK0
Serial Reception
Stop
1 2 3 4
D7 D6 D5
READY
Serial Reception
SIO0
Read
INTCSI0
Generation
5 6 7 8 9
D4 D3 D2 D1 D0
Data
INTCSI0
Generation
ACKT
FFH Write
Receive Data Processing
Set to SIO0
ACK
Serial
Output
Reception
1 2
ACK BUSY READY D7 D6
Write to
SIO0
ACKD BUSY BUSY
Set Output Clear