AD7705的接口迷失的处理
The serial interface can be reset by exercising the RESET input
on the part. It can also be reset by writing a series of 1s on the
DIN input. If a Logic 1 is written to the AD7705/AD7706 DIN
line for at least 32 serial clock cycles the serial interface is reset.
This ensures that in three-wire systems, if the interface gets lost
either via a software error or by some glitch in the system, it can
be reset back to a known state. This state returns the interface
to where the AD7705/AD7706 is expecting a write operation to
its Communications Register. This operation in itself does not
reset the contents of any registers but since the interface was
lost, the information written to any of the registers is unknown
and it is advisable to set up all registers again.
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