NEC PD750008 User Manual
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µPD750008 USER'S MANUAL
Figure 5-68. Command 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
C7
Hardware operation
C6
C5
C4
C3
C2
C1
C0
ACK
READY
Command
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
Output
BUSY
Clear
BUSY
BUSY
Set
CMDT
Write
to SIO
Set
ACKD
Stop
SCK
Read
SIO
Analyze
command
Set
ACKT
Clear
BUSY
Set
CMDD
Output
ACK