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RM0090: Reference manual - STMicroelectronics

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Inter-integrated circuit (I 2 C) interface <strong>RM0090</strong><br />

A 9th clock pulse follows the 8 clock cycles of a byte transfer, during which the receiver must<br />

send an acknowledge bit to the transmitter. Refer to Figure 238.<br />

Figure 238. I 2 C bus protocol<br />

SDA<br />

SCL<br />

Start<br />

condition<br />

MSB<br />

Acknowledge may be enabled or disabled by software. The I 2 C interface addresses (dual<br />

addressing 7-bit/ 10-bit and/or general call address) can be selected by software.<br />

The block diagram of the I 2 C interface is shown in Figure 239.<br />

705/1416 Doc ID 018909 Rev 3<br />

1 2 8 9<br />

ACK<br />

Stop<br />

condition

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