4.1.3.2 Start/Stop Condition

All transactions involving the AT21CS01/AT21CS11 begin with a Start condition, which can only be initiated by the host to the client. Similarly, all transactions are terminated with a Stop condition, which can also only be transmitted by the host to the client.

The Start and Stop conditions require identical biasing of the SI/O line. The Start/Stop condition is created by holding the SI/O line at a voltage of V_PUP for a duration of t_HTSS. Refer to AT21CS01/AT21CS11 AC Characteristics for timing minimums and maximums.

Figure 4-4 and Figure 4-5 depict the Start and Stop conditions.

Figure 4-4. Start Condition Waveform

Figure 4-5. Stop Condition Waveform