NEC PD750008 - Manual (Page 189)

169
CHAPTER 5 PERIPHERAL HARDWARE FUNCTIONS
Figure 5-67. Address Transfer Operation from Master Device to Slave Device (WUP = 1)
Program processing Hardware operation Program processing
SCK pin
12
345
6
78
9
SB0 or SB1 pin
A7
Hardware operation
A6
A5
A4
A3
A2
A1
A0
ACK
READY
Address
Master device processing (transmitter) Transfer line Slave device processing (receiver)
Interrupt handling (preparation for next serial transfer)
Set ACKD
Serial transmission
Generate IRQCSI
Clear BUSY
Serial reception
Output BUSY
Clear BUSY
BUSY
Set CMDT
Set RELT
Set CMDT
Write to SIO
Stop SCK
WUP<-0
Set ACKT
Set CMDD
Clear CMDD Set RELD
Set CMDD
Generate IRQCSI
(When SVA = SIO)
Output ACK