For data communication, the I2C module has a serial data pin (SDA) and a serial clock pin (SCL), asshown in Section 20.6. These two pins carry information between the 28x device and other devicesconnected to the I2C bus. The SDA and SCL pins both are bidirectional. They each must be connected toa positive supply voltage using a pull-up resistor. When the bus is free, both pins are high. The driver ofthese two pins has an open-drain configuration to perform the required wired-AND function.