Contents
What makes I2C communication with a PIC microcontroller?
Clock generated by the master on SCL line will cause the data to shift in and shift out of the SSPSR register which makes the I2C communication happen. Bit 0 BF : This is the Buffer Full status bit.
What does C stand for in I2C protocol?
C is a Synchronous protocol I C is synchronous, the clock rate can -232 style) I2C is a synchronous protocol that allows a master device to initiate communication with a slave device. Data is exchanged between these devices. Since I2C is synchronous, it has a clock pulse along with the data.
Where does data go when sent on the I2C bus?
Once a byte of data has been sent to the master via I2C, it is sent to the SSPBUF register. Data to be sent on the I2C bus is also sent to the SSPBUF register, which is then sent via I2C. SSPBUF holds data to transmit or received data, depending on the current mode of the MSSP module.
Which is an example of a PIC microcontroller?
For example, we can have a microcontroller or host device which is connected to different slave devices like I/O Port Expanders, LED/ LCD Drivers, ADCs, DACs, EEPROMs, Real Time Clock (RTC) etc. Most of the PIC microcontrollers have built in Master Synchronous Serial Port (MSSP) module which can be configured to operate in following modes.
Why is the I2C bus immune to such conditions?
If 2 master MCUs (MCU1 And MCU2) are sending data to the same slave (motor driver) at the same time. This will cause no problem, and here is why I2C bus is immune to such conditions. Both messages are identical in the first part (address) as they are actually sending to the same slave with the same address.
What makes an I2C bus a multi master bus?
It is a true multi-master bus including collision detection and arbitration to prevent data corruption if two or more masters simultaneously initiate data transfer.
What does I2C stand for in serial communication?
I 2 C or IIC or I2C stands for Inter-Integrated Circuit. It is a very popular multi-master, multi-slave serial communication interface developed by Philips. I 2 C uses two bidirectional open drain data lines, Serial Data (SDA) and Serial Clock (SCL) with pull up resistors as shown below.
How is the I2C clock rate calculated on a microchip?
The I2C clock is generated by dividing down your clock frequency/4, so there is no way it can be faster than a quarter of your clock frequency. The datasheet for the I2C temp sensor (MIC384) has a Minimum clock period of 2.5us for the serial interface timing. This is 400kHz so hence my reasoning for that desired clock speed.
Why are there so many problems with I2C?
Each byte received by the master is followed by an ACKM (ack-ed by the master) EXCEPT for the last byte, in which case the master will not ACK it, causing a NAK to proceed the stop condition! To make this even harder, most I2C hardware peripherals will not allow you fine-grained control of whether the master will ACK or NAK.
How is the I2C bus designed to work?
Very often the peripheral will just blithely ack every byte that it reads from the slave regardless. The I2C bus is designed to be driven only through open-drain connections pulling the bus down, it is pulled up by a pair of pull-up resistors (one on the clock line and one on the data line).
Is the mikroC Pro for PIC hardware independent?
The mikroC PRO for PIC provides routines for implementing Software I²C communication. These routines are hardware independent and can be used with any MCU. The Software I²C library enables you to use MCU as Master in I²C communication.
Which is the best compiler for I2C communication?
We will see I2C code examples with two popular compilers such as MPLAB XC8 and MikroC Pro. At the start, we will see the introduction of I2C communication. Secondly, we will understand the control and configuration registers of PIC Microcontroller I2C module.
Where did the I2C communication protocol come from?
I2C (i-square-c) is an acronym for “Inter-Integrated-Circuit” which was originally created by Philips Semiconductors (now NXP) back in 1982. I2CTM is a registered trademark for its respective owner and maybe it was the reason they call it “Two Wire Interface (TWI)” in some microcontrollers like Atmel AVR.