NEC PD78214 - Manual (Page 319)

290
µ
PD78214 Sub-Series
Fig. 10-29 Sending Data from Master Device to Slave Device
Program processing Hardware operation Program processing
SCK pin
12
345
6
78
SB0 pin
D7
Hardware operation
D6
D5
D4
D3
D2
D1
D0
ACK
READY
Data
Master device processing (transmitter) Transfer line Slave device processing (receiver)
Interrupt handling (preparation for next serial transfer)
Serial transmission
Generate INTCSI
Serial reception
Generate INTCSI
BUSY
Write to SIO
Set ACKD
Stop SCK
Read SIO
Set ACKT
Clear BUSY
Output BUSY
Output ACK
Clear BUSY
Remark
This timing is valid only under the following conditions:
•
The master is only allowed to transmit data.
•
The slave is only allowed to receive data.
ACKE is set to 0 and BSYE is set to 1.