NEC PD75402A - Manual (Page 128)

117
CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
Fig. 5-52 Data Transmission from Slave Device to Master Device ★
Master Device Processing (Reception Side)
Program
Processing
Hardware
Operation
Transfer Line
SCK Pin
SB0 Pin
Program
Processing
Hardware
Operation BUSY
Clear-
ance
Serial Transmit Operation
IRQCSI
Genera-
tion
BUSY
Output BUSY
Clear-
ance ACKD
Setting
Write
to
SIO Write
to
SIO
BUSY READY D7 D6 D5 D4 D3 D2 D1 D0
Data
1 2 3 4 5 6 7 8 9
ACK BUSY
READY
D7 D6
1 2
IRQCSI
Genera-
tion ACK
Output Serial
Reception
Receive Data Processing
Serial Receive Operation
ACKT
Setting
SIO
Read
FFH Write
to SIO
SCK
Stop-
page
Slave Device Processing (Transmission Side)
FFH Write
to SIO