NEC PD78214 User Manual
Page 427
398
µ
PD78214 Sub-Series
Fig. 16-3 Example of Communication with SBI
Address
Command
Command
SB0
Address
Command
Data
Command
SB0
Address
Command
Data
Data
SB0
Address
Data
Data
Data
SB0
Address
Data
Data
Command
Data
SB0
: Bus release
: Command trigger
Fig. 16-4 Serial Bus Communication Timing
A7
A0
8
9
ACK
BUSY
SCK
SB0
C7
C0
8
9
ACK
BUSY
SCK
SB0
READY
Address transfer
Command transfer
D7
D0
8
9
ACK
BUSY
SCK
SB0
READY
Data transfer
Bus release signal
Command signal
Selection of slave CPU (a feature of SBI)