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AS2Cwire relies on the number of rising edges of the
EN/SET pin to address and load the registers.
AS2Cwire latches data or address after the EN/SET

pin has been held high for time TLAT. Address or data
is differentiated by the number of EN/SET rising
edges. Since the data registers are 4 bits each, the
differentiating number of pulses is 24 0r 16, so that
Address l is signified by 17 rising edges, Address 2
by 18 rising edges, and so forth. Data is set to any
number of rising edges between l and including 16.
A typical write protocol is a burst of EN/SET rising
edges, signifying a particular Address, followed by a
pause with EN/SET held high for the TLAT timeout
period, a burst of rising edges signifying Data, and a
TLAT timeout for the data registers. Once an address
is set, then multiple writes to the corresponding data
register are allowed.
PKT4713APIF   datasheet