NEC PD75P402 User Manual download pdf (Page 110)

CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS

(e) Acknowledge signal (ACK)

The acknowledge signal is used to confirm serial data reception between the sender and receiver.

Fig. 5-40 Acknowledge Signal

The acknowledge signal is a one-shot pulse synchronized with the fall of SCK after an 8-bit data transfer.

Its position is arbitrary and it can be synchronized with any SCK clock cycle.

After 8-bit data transmission the sender checks whether the receiver has sent back an acknowledge signal.

If an acknowledge signal is not returned within a specific time after data transmission, reception can be judged

not to have been performed correctly.

[When output in synchronization with 11th SCK clock cycke]

SCK

SB0

[When output in synchronization with 9th SCK clock cycke]

ACK

8 9 10 11

8

9

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NEC PD75P402 User Manual Page 110