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Chapter 10 Clock Synchronous Serial Interface
10
Fig. 10-28 Sending a Command from Master Device to Slave Device
Program processing
Hardware operation
Program processing
SCK pin 12345678
SB0 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
INTCSI
Serial reception Generate
INTCSI
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
Remark This timing is valid only under the following conditions:
The master is only allowed to transmit a command.
The slave is only allowed to receive a command.
ACKE is set to 0 and BSYE is set to 1.