NEC PD75402A - Manual (Page 127)

116
CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
Fig. 5-51 Data Transmission from Master Device to Slave Device
Program
Processing
Hardware
Operation
Master Device Processing
(Transmission Side)
Transfer Line
SCK Pin
SB0 Pin
Slave Device Processing
(Reception Side)
Program
Processing
Hardware
Operation
Serial Receive Operation
Serial Transmit Operation
Write
to SIO
1 2 3 4 5 6 8 7 9
D7 D6 D5 D4 D3 D2 D1 D0
Data
Interrupt Servicing
(Preparation for Next Serial Transfer)
IRQCSI
Genera-
tion ACKD
Setting SCK
Stop-
page
READY BUSY ACK
ACKT
Setting SIO
Read
IRQCSI
Genera-
tion ACK
Output BUSY
Output BUSY
Clear-
ance
BUSY
Clear-
ance