Learn the basics of i2c communication with pic microcontroller. The registers which control the spi communication for pic16f8777a is the sspstat and the sspcon register. Example code for using pic hardware i2c me labs forums. As an introduction to pic assembly programming, well be using pic16f84a, a x14 architecture microcontroller by microchip. Pic16f877 is an 8bit pic microcontroller that is introduced by microchip and is mainly used in automation and embedded systems. Pic16f877a introduction microcontroller pic16f877a is one of the picmicro family microcontroller which is popular at this moment, start from beginner until all professionals. In this tutorial we will learn how to use an external interrupt in pic microcontroller and whywhere we will need them. Pic16f877a introduction, pinout, features, examples, datasheet.
Pin diagrams 10 pic16f873a876a 11 2 3 4 5 6 1 8 7 9 12 14 15 16 17 18 19 20 23 24 25 26 27 28 22 21 mclr. The pic16f877a mssp, which is responsible for both i2c and spi, allows only up to 400 khz on the i2c bus which is the fastmode rate. For demonstration we are using pic 16f877a microcontroller. Many possibilities exist and they will be discussed in detail in the manual for the device you are interfacing to. May 01, 2017 in this tutorial we will see how to interface a 16x2 character lcd module with pic 16f877a microcontroller using ccs c compiler. I2c communication with pic microcontroller, eeprom interfacing. There are many displays out there based on ks0108 or compatible display controller. Aug 14, 2017 the circuit diagram for using pic16f877 interrupts is given in the above image. Learn how to use mplab code configurator to quickly configure your i2c bus. It comes in three packages known as pdip, plcc, and qfn where the first one is 40pin while other two come with a 44pin interface.
I2c communication with pic microcontroller pic16f877. In this example, pic16f877a acts as a master device and 24c64 eeprom as a slave device. This powerful 200 nanosecond instruction execution yet easyto. Interintegrated circuit i2c full master mode slave mode with general address call which means that we need to configure this module in order to have it operating as an spi or i2c interface. When enabled, the sqwe bit set to 1, the sqwout pin outputs one of four square wave frequencies 1hz, 4khz, 8khz, 32khz. Well take a look again at the assembly code posted above. Now to connect the interrupt pin, we should look at the datasheet to know which pin of the pic is used for external interrupt. Word is the result of seqentially reading two consecutive memory addresses sspen 1. Through using interintegrated circuit i2c bus specifications, one. Introduction this is a tutorial by example developed for those who have purchased our serial mplab pic16f87x development package. Pic16f877a interrupt tutorial external, timer, uart intr.
This small post shows an example for connecting lcd with hd44780 or complaint controller with microchip pic12f1822 8bit microcontroller, this microcontroller has only 8 pins of which 5 can be used as outputs, therefore an i2c lcd is required. Mplab xc8 for beginners tutorial 37 i2c communication, part 2. I took me more than one year to write and compile these tutorials. Pic16f887, res, cap, crystal, m24512, ds1621, ds7 y lm016l. Picmicro ssp module block diagram i2c slave modessp bits that indicate module status bf sspstat. We have already learnt i2c communication with pic and so we must be familiar with how i2c works and where we can use them like i2c can be used to interface rtc module. Complete list of pic microcontroller tutorials microchip. This is the chip we introduced in the previous article. You can read more about them on page 74 and 75 of the datasheet. Interfacing pic microcontroller with i2c lcd mikroc projects. The tutorial begins with instructions on selecting a specific pic and ends with directions for breadboarding the microcontroller. Pic microcontrollers the basics of c programming language references. Arduino is an opensource microcontroller perfect for prototyping or hobbyists.
In this i2c tutorial you will learn all about the 2 wire i2c serial protocol. Now we are going to see pic16f877a interrupt tutorial. I2c communication protocol tutorial i2c bus with pic microcontroller. In this article, well deep dive into i2c serial communication protocol. I2c communication tutorial will help you understand further. I2c uses two bidirectional open drain data lines, serial data sda and serial clock scl with pull up resistors as shown below. Circuito electronico comunicacion i2c microcontroladores pic. An introduction to pic assembly language programming. There is a more modern part the 16f887 that has nearly the same functionality as the 16f877a but also includes an internal clock like the 16f88 and the 18f4550. This tutorial only talks about spi in pic16f877a using xc8 compiler, the process will be the same for other microcontrollers but slight changes might be required. Because very easy using pic16f877a and use flash memory technology so that can be writeerase until thousand times.
C is a serial computer bus, which is invented by nxp semiconductors previously it is named as philips semiconductors. Pic 16f877a has the following 15 interrupt sources. From section 30 p 29 of midrange family technical manual. In this tutorial, you will learn all about the i2c communication protocol, why you would want to use it, and how its implemented. Oct 19, 2018 the i2c lcd is connected with the microcontroller via 2 lines. I 2 c or iic or i2c stands for interintegrated circuit.
This small post shows an example for connecting lcd with hd44780 or complaint controller with microchip pic12f1822 8bit microcontroller, this microcontroller has only 8 pins of which 5 can be used as. How to use interrupts in pic microcontroller pic16f877a. I2c master mode i2 c master mode microchip technology. Using the pic devices ssp and mssp modules for slave i2c.
I hope this help you to get start with pic microcontrollers. Read the i2c protocol guide for more information on i2c. Introduction to pic16f877a the engineering projects. Interfacing with pic microcontrollers part 4 besides led and 7segment display, lcd is another useful device to show programs current state, to give instructions, for debugging and so. I have compiled a complete list starting from beginners level tutorials, intermediate level tutorials and advance level tutorials. The pic1684a, having only a few registers to work with, is good for beginners to microcontroller programming. Pic tutorial pic micro controller programming and basics. Pic16f87xa ds39582bpage 2 2003 microchip technology inc. And thats the goal of this tutorial, to see how can we set up the mssp module to operate as a slave or a master. In our case i n pic16f877a the 33 rd pin rboint is.
Unlike uart, you can connect and communicate to multiple devices using the same i2c bus. In the transmit mode this bit will set when we write data to sspbuf. In this tutorial we will see how to interface and graphical lcdglcd with pic16f877a. You simply have to connect the lcd to the pic as we did in interfacing lcd tutorial. Jun 25, 2018 i2c lcd driver for ccs pic c compiler. Rb0int external interrupt flag bit 1 the rb0int external interrupt occurred must be cleared in software 0 the rb0int external interrupt did not occur. Jameco part number 247038 2001 microchip technology inc. I2c i2c overviewoverview l i2c is a bidirectional protocol l data is sent either direction on the serial data line sda by the master or slave. I have lots of examples on using the i2c bus on the website, but many of these are using high level controllers and do not show the detail of what is actually happening on the bus. I is a bidirectional protocol i2c is a bidirectional protocol.
This powerful 200 nanosecond instruction execution yet easytoprogram only 35 single word instructions cmos flashbased 8bit microcontroller packs microchips powerful pic architecture into an 40 or 44pin package and is upwards compatible with the pic16c5x, pic12cxxx. Rb port change interrupt flag bit 1 at least one of the rb7. The datasheet of pic16f877a microcontroller and more detailed features can be found at the bottom of this page. This is enough to do many different projects see links at end of this page for some example projects on this site. I2c driver for pic16f877a with proteus simulation i2c. The 16f877a is a capable microcontroller that can do many tasks because it has a large enough programming memory large in terms of sensor and control projects 8k words and 368 bytes of ram. The i2c protocol supports either a 7bit addressing mode, or. The scl,sda and sqw are open drain and must be pulled up with appropriate pull up resistors as shown in the image. Many of todays applications, however, require higher bus speeds and lower supply voltages. Judging from my emails, it is quite clear that the i2c bus can be very confusing for the newcomer. Pic16f877 based projects pic microcontroller pdf pic.
Inside the header file we have to initialize the spi communication for pic16f877a. It means that devices connected to i2c bus will be either master or slave. This is enough to do many different projects see links at. Pic16f877a is a 40pin pic microcontroller and is used mostly in embedded projects and applications. Please go through our tutorial and feel free to ask your doubts in comments section. Pic16f877a i2c tutorial eeprom interfaing embetronicx. May 31, 2018 pic16f877 based projects pic microcontroller list. Introduction to pic16f877 the engineering projects. The protocol allows you to connect many devices to a single set of two wires, and then. Spi communication with pic microcontroller pic16f877a. Let us learn how we can pic microcontroller spi communication using the mplabx ide and xc8 compiler. Driver source code is below which can be downloaded from the link below. The data sheet for the 24c16 eeprom well experiment with says the first most significant four bits of the slave.
Picmicro ssp module block diagram i2c slave modessp bits that indicate module status bf sspstat the bf buffer full bit tells the user whether a byte of. Here is a complete list of pic microcontroller tutorial for beginners. I2c lcd driver for ccs pic c compiler simple projects. It has five ports on it starting from port a to port e. Introduction to pic as you may know already, pic is the name of microcontrollers developed by microchip corporation. Usually, the microcontroller can process commands much quicker than an i2c device, so a. This project works also with dfrobot i2c lcd displays the compiler used in this project is mikroelektronika mikroc pro for pic. Mar 23, 2019 we have already learnt i2c communication with pic and so we must be familiar with how i2c works and where we can use them like i2c can be used to interface rtc module. Data can flow in any direction on the i2c bus, but when it flows is controlled by the master device. A block diagram of the ssp module for i2c slave mode is shown. It has five ports on it starting from port a to port e it has three timers in it, two of which are 8 bit timers while 1 is 16 bit it supports many communication protocols like. This pin must be connected to sda pin of the i2c busmaster.
It is normally denoted as i2c or i squared c or even as 2wire interface protocol twi at some places but it all means the same. Additional routines for the pic16f628 including sfr definitions, flashing an led and use of the hardware uart. I2c communication with an arduino alex lange ece 480 design team 3 november, 2015 executive summary. But now, why do we need spi protocol when we already have i2c. This powerful 200 nanosecond instruction execution yet easytoprogram only 35 single word instructions cmos flashbased 8bit microcontroller packs microchips powerful pic architecture into an 40 or 44pin package and is upwards compatible with the pic16c5x, pic12cxxx and pic16c7x. I2c driver for pic16f877a with proteus simulation i2c driver for. As always the best place to start is the pic16f877a datasheet. The reason is both i2c and spi communications are advantages in its own ways and hence is application specific. Integrating a microcontroller with a i2c peripheral device. I2c communication with pic microcontroller mplab xc8. This is a part of the sequence of pic tutorials in which we started learning pic microcontrollers from scratch. They are easy to use, have a multitude of optional arduinocompatible boards such as. In this tutorial we will look at interfacing ks0108 controller based jhd12864e display. In fact the fastest i2c mode, ultra fast, can reach only up to 5 mhz while some spi busses can reach 50 mhz.
I2c is a synchronous communication protocol meaning, both the devices that are sharing the information must share a common clock signal. This i2c tutorial shows you how the i2c protocol or more correctly written i 2 c sometimes written as iic stands for inter ic communication and is intended for very short distance communication between ics on a single pcb. Scl is a serial clock line and sda is serial data line. Use of the pic16f877 as an i2c slave and spi slave. Read from one register in a device s a6 a5 a4 a3 a2 a1 a0 0 device slave address7 bits b7 b6 b5 b4 b3 b2 b1 b0 a register address n 8 bits a start ack ack. We have arranged the pic tutorial in order from start to end below.
Pic microcontrollers the basics of c programming language. It gives you a fully defined protocol for data transfer between multiple devices over two wires. Spi tutorial with pic microcontrollers serial peripheral. Pic16f877a also support i2c communication and its has one module for i2c communication. I 2 c uses two bidirectional open drain data lines, serial data sda and serial clock scl with pull up resistors as shown below. The pic16f877a mssp, which is responsible for both i2c and spi, allows only up to 400 khz. It is a very popular multimaster, multislave serial communication interface developed by philips. The interintegrated circuit i 2 c protocol is a protocol intended to allow multiple slave digital.