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(e) Acknowledge signal (ACK)
This signal is used between the sending side and receiving side devices for confirmation of correct serial
data sending.
Remark The broken line indicates the READY state.
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The acknowledge signal is a one-shot pulse synchronous with SCK0 falling, whose position can be
synchronized with SCK0 in any clock.
The sending side that has transferred 8-bit data checks if the acknowledge signal has been sent back by
the receiving side. If this signal is not sent back by the slave device for a period after data sending, this
means that the data sent has not been received correctly by the slave device.
290
CHAPTER 15 SERIAL INTERFACE CHANNEL 0 ( µ PD78014 Subseries)
Figure 15-19. Acknowledge Signal
(When output synchronously with SCK0 in 11th clock.)
SCK0
SB0 (SB1)
(When output synchronously with SCK0 in 9th clock.)
SCK0
SB0 (SB1)
8
9
10
11
ACK
8
9
ACK
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