User's Manual

170
µPD750008 USER'S MANUAL
Figure 5-68. Command Transfer Operation from Master Device to Slave Device
Program processing
Hardware operation
Program processing
SCK pin
123456789
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