NEC PD750008 User Manual
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CHAPTER 5 PERIPHERAL HARDWARE FUNCTIONS
Figure 5-69. Data Transfer Operation from Master Device to Slave Device
Program processing
Hardware operation
Program processing
SCK pin
12
345
6
78
9
SB0 or SB1 pin
D7
Hardware operation
D6
D5
D4
D3
D2
D1
D0
ACK
READY
Data
Master device processing (transmitter)
Transfer line
Slave device processing (receiver)
Interrupt handling (preparation for next serial transfer)
Serial transmission
Generate
IRQCSI
Serial reception
Generate
IRQCSI
BUSY
Write
to SIO
Set
ACKD
Stop
SCK
Read
SIO
Set
ACKT
Clear
BUSY
Output
BUSY
Output
ACK
Clear
BUSY