NEC PD78058FY(A) - Manual (Page 311)

311
CHAPTER 16 SERIAL INTERFACE CHANNEL 0 (
µ
PD78058F SUBSERIES)
8 9
ACK
SCK0
SB0 (SB1)
SCK0
SB0 (SB1)
8 9 10 11
ACK
(e) Acknowledge signal (ACK)
The acknowledge signal is used to check serial data reception between transmitter and receiver.
Figure 16-18. Acknowledge Signal
[When output in synchronization with 11th clock SCK0]
[When output in synchronization with 9th clock SCK0]
Remark The dotted line indicates READY status.
The acknowledge signal is one-shot pulse to be generated at the falling edge of SCK0 after 8-bit data
transfer. It can be positioned anywhere and can be synchronized with any clock SCK0.
After 8-bit data transmission, the transmitter checks whether the receiver has returned the acknowledge
signal. If the acknowledge signal is not returned for the preset period of time after data transmission, it
can be judged that data reception has not been carried out correctly.