I2C Master Block Diagram – PIC Microcontroller I 2C Slave We need to write to SSPCON1 and SSPADD registers to configure MSSP module as I☬ Master and to set the clock frequency of I☬ communication respectively. You can easily modify the program to work in 10 bit mode. In this example we are demonstrating 7 bit mode only as it is the commonly used one. MSSP module can be configured to operate in both 10 bit and 7 bit address mode. Let’s see in detail about working of MSSP module of PIC Microcontroller in I☬ mode. You can easily convert it for other microcontrollers if you understand it clearly. For demonstration we are using PIC 16F877A microcontroller.
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In this tutorial we will learn how to operate MSSP module of PIC Microcontroller as I 2C master or slave. Inter-Integrated Circuit (I 2C) – Slave, Master & Multi-master modes.Most of the PIC microcontrollers have built in Master Synchronous Serial Port (MSSP) module which can be configured to operate in following modes. R/W bit indicates whether the master wants to read data from or write data to the slave. 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. So the slave with that particular address will be activated at that moment. The master will send address of slave + R/W bit first, then followed by other data. Each slaves are identified or addressed by a unique address. But commonly we are using single master and multiple slaves. An I 2C bus can have multiple masters and multiple slaves. Slaves are the devices which responds to master and it cannot initiate a communication. The master is the device which initiate communication and it drives clock (SCL) line.
It means that devices connected to I 2C bus will be either master or slave.
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