NEC PD78214 - Manual (Page 320)

291
Chapter 10 Clock Synchronous Serial Interface
10
Fig. 10-30 Sending Data from the Slave Device to the Master Device
Program processing Hardware operation Program processing
SCK pin
12
345
6
78
12
SB0 pin
BUSY
READY
D7
Hardware operation
D6
D5
D4
D3
D2
D1
D0
ACK
BUSY
D7
D6
READY
Data
Master device processing (receiver) Transfer line Slave device processing (transmitter)
Read SIO
Read SIO
Set ACKT
Receive data processing
Stop SCK
Serial reception
Generate INTCSI
Output ACK
Serial reception
Write to SIO
Write to SIO
Clear BUSY
Serial transmission
Generate INTCSI
Set ACKD
Output BUSY
Clear BUSY
3
D5
Remark
This timing is valid only under the following conditions:
•
The master is only allowed to receive data.
ACKE is set to 0.
•
The slave is only allowed to transmit data.
BSYE is set to 1.