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START and STOP cond itions

3.1.4

All transactions begin with a START (S) and are terminated by a STOP (P) (see Figure 5).

A HIGH to LOW transition on the SDA line while SCL is HIGH defines a START condition.

A LOW to HIGH transition on the SDA line while SCL is HIGH defines a STOP condition

SDA

SCL

STOP condition

START condition

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Fig 5.

START and STOP conditions

START and STOP conditions are always generated by the master. The bus is considered

to be busy after the START condition. The bus is considered to be free again a certain

time after the STOP condition. This bus free situation is specified in Section 6