Electronics America 8-Bit Single-Chip Microcontrollers User's Manual

328
CHAPTER 16 SERIAL INTERFACE CHANNEL 0 (
µ
PD78054 Subseries)
Figure 16-28. Command Transmission from Master Device to Slave Device
1 2 3 4 5 6 7 8 9SCK0 Pin
C7 C6 C5 C4 C3 C2 C1 C0 ACK BUSYSB0 (SB1) Pin
Program Processing
Serial Transmission
INTCSI0
Generation
ACKD
Set
SCK0
Stop
Hardware Operation
ACKT
Set
Program Processing
INTCSI0
Generation
ACK
Output
Hardware Operation
CMDT
Set
Write
to SIO0
Interrupt Servicing
(Preparation for the Next Serial Transfer)
Master Device Processing (Transmitter)
Transfer Line
Slave Device Processing (Receiver)
CMDD
Set
Serial Reception
BUSY
Output
READY
Command
BUSY
Clear
BUSY
Clear
SIO0
Read
Command
analysis