![]() ![]() We have already answered these questions for the SPI interface protocol, now it is time to look at the answers for the I2C interface protocol. How does the peripheral know when it is supposed to receive bytes and when it is supposed to transmit bytes?Īll of these questions and many more are answered by the protocol.What constitutes a CLK event? The master could use either a falling-edge or a rising-edge clock to specify a sampling signal to the peripheral device.Either method is fine, but the peripheral and master must agree beforehand otherwise, incorrect bytes will be received. ![]() In what order are the series of bits shifted across the data line? Suppose the master transmits the most-significant bit (MSB) first, then the peripheral will receive the series in the order.There are many questions that need to be answered when defining a serial communications protocol: The peripheral device may be completely passive i.e., there is no controlling mechanism in place within the peripheral or complex enough to include an embedded controller, in which case the protocol may be more sophisticated. Protocols may specify many aspects of inter-device communications including bit ordering, bit-pattern meanings, electrical connections, and even mechanical considerations in some cases. A protocol is the language that governs communications between systems or devices. All of these peripherals interface with the microcontroller via a serial protocol. ITG -3200 Triple – Axis Digital – Output Gyro SPI or I2CĬommunication methods can be divided into the two categories parallel and serial.BMA 180 Triple Axis Accelerometer SPI or I2C.DS1307 RTC (Real-Time Clock), Textbook section 18.4 “DS1307 RTC Interfacing and programming”.PCA9685: 16-channel, 12-bit PWM I☬-bus LED controller.PCA9564 Parallel bus to I2C bus controller.Many embedded systems include peripheral devices connected to the microprocessor in order to expand its capabilities including ![]() Source: NXP UM10204 I2C-bus specification and user manual ![]()
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