I2C: Difference between revisions
Jump to navigation
Jump to search
No edit summary |
No edit summary |
||
| Line 1: | Line 1: | ||
I2C address | The I2C slave address is coded on 7-bit and is shifted to the left for 1 bit to code the read-write (RW) bit. | ||
{| class="wikitable" | |||
!Operation | |||
!RW | |||
|- | |||
|Write | |||
|0 | |||
|- | |||
|Read | |||
|1 | |||
|} | |||
addr << 1 | RW | addr << 1 | RW | ||
Start: A high-to-low transition of SDA with SCL high | Start: A high-to-low transition of SDA with SCL high | ||
| Line 9: | Line 16: | ||
Stop: A low-to-high transition of SDA with SCL high | Stop: A low-to-high transition of SDA with SCL high | ||
Acknowledge (ACK): On the ninth clock cycle after every address or data byte is transferred, the receiver | Acknowledge (ACK): On the ninth clock cycle after every address or data byte is transferred, the receiver will pull the SDA pin low to acknowledge proper reception of the byte. | ||
will pull the SDA pin low to acknowledge proper reception of the byte. | |||
of the byte or that this byte completes the group transfer. | Not Acknowledge (NOT ACK): Alternatively, on the ninth clock cycle after every address or data byte is transferred, the receiver can leave the SDA pin high to indicate that there was a problem with the reception of the byte or that this byte completes the group transfer. | ||
== Resources == | == Resources == | ||
Latest revision as of 20:18, 7 October 2017
The I2C slave address is coded on 7-bit and is shifted to the left for 1 bit to code the read-write (RW) bit.
| Operation | RW |
|---|---|
| Write | 0 |
| Read | 1 |
addr << 1 | RW
Start: A high-to-low transition of SDA with SCL high
Stop: A low-to-high transition of SDA with SCL high
Acknowledge (ACK): On the ninth clock cycle after every address or data byte is transferred, the receiver will pull the SDA pin low to acknowledge proper reception of the byte.
Not Acknowledge (NOT ACK): Alternatively, on the ninth clock cycle after every address or data byte is transferred, the receiver can leave the SDA pin high to indicate that there was a problem with the reception of the byte or that this byte completes the group transfer.
Resources
| I2C specification | http://www.nxp.com/documents/user_manual/UM10204.pdf |
| SCCB specification | http://www.ovt.com/download_document.php?type=document&DID=63 |