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CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS
(e) Acknowledge signal (ACK)
The acknowledge signal is used to confirm serial data reception between the sender and receiver.
SCK
SB0
SCK
SB0
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.
Fig. 5-40 Acknowledge Signal
[When output in synchronization with 11th SCK clock cycke]
[When output in synchronization with 9th SCK clock cycke]
8
9
10
11
ACK
8
9
ACK
99
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