NEC uPD78P078 - Manual (Page 354)

354
CHAPTER 17 SERIAL INTERFACE CHANNEL 0 (
µ
PD78078 SUBSERIES)
1 2 3 4 5 6 7 8 9 SCK0 Pin
D7 D6 D5 D4 D3 D2 D1 D0 ACK BUSY SB0 (SB1) Pin
Program Processing
Serial Transmission
INTCSI0
Generation
ACKD
Set
SCK0
Stop
Hardware Operation
ACKT
Set
Program Processing
INTCSI0
Generation
ACK
Output
Hardware Operation
Write
to SIO0
Interrupt Servicing
(Preparation for the Next Serial Transfer)
Master Device Processing (Transmitter)
Transfer Line
Slave Device Processing (Receiver)
Serial Reception
BUSY
Output
READY
Data
BUSY
Clear
BUSY
Clear
SIO0
Read
Figure 17-29. Data Transmission from Master Device to Slave Device