what may happen if two serially interfaced devices work under the control of different clock cycles? what may happen if two serially interfaced devices work under the control of different clock cycles?
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Answer:
Sanjeeb Mishra, ... Vijayakrishnan Rousseau, in System on Chip Interfaces for Low Power Design, 2016
Clock stretching
A slow slave device can do a clock stretching to pause a transaction by holding the SCL line LOW. The transaction cannot continue until the line is released HIGH again. On the byte level, a device may be able to receive bytes of data at a fast rate but needs more time to store a received byte or prepare another byte to be transmitted. Slaves can then hold the SCL line LOW after reception and acknowledgment of a byte to force the master into a wait state until the slave is ready for the next byte transfer in a type of handshake procedure. On the bit level, a device (either master or slave) can slow down the bus clock by extending each clock LOW period to match its bit-processing capabilities. This essentially means that even a slow device can be attached to a fast device, but the dynamics of the wired and logic will allow the transaction to occur at that lowest speed among the device connected.
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