Ports and timers in pic 16f877a microcontroller pdf

Pic16f84belongs to a class of 8bit microcontrollers of risc architecture. This chip called pic1650 was meant for totally different purposes. The pic 16f877 chip basically has 5 inputoutput ports. It resets the microcontroller and is active low, meaning that it. Below table provides the details of the three timers. In 1989 microchip technology corporation introduced an 8bit microcontroller called pic microcontroller which stands for peripheral interface controller. The microcontroller pic16f877 has 3 different timers. Serial communication serial communication is the method for transferring onebit data at a time sequentially over a communication channel. Pic countdown timer using pic16f84a pic microcontroller. It has a comparator module which composed of two comparators.

Introduction to pic16f877a the engineering projects. In this tutorial we will learn, how to use the adc module of a pic microcontroller using mplab xc8 compiler. Accordingly, the program is divided in four parts that you have to go through as per the following order. The microcontroller clock is generated by an external 10mhz crystal. As like normal microcontroller, the pic chip also combines a microprocessor unit called cpu and is integrated with various types of memory modules ram, rom, eeprom,etc, io ports, timers counters, communication ports, etc. Its corresponding data direction register is trisa. The parallel slave port is not implemented on the 28pindevices.

It can be the clock input of timer 1 or the oscillator output of timer 2. The interface ports to be of any use, a computer must be able to interact with its environment. Pic16f877a microcontroller based projects list dc motor and fan speed control using pic16f877 microcontroller using pwmpulse width modulation technique here is a simple project on how to control fan or dc motor speed with microchip pic16f877 microcontroller. The reference manual should be considered a complemen.

About ten years later, by adding eeprom memory, this circuit was. Midrange pic family has one to three timers depending on the family, timer can use either as timers to generate delay or as counters to count events happening outside the microcontrollers. These timer modules are usually denoted by the symbols timer0, timer1, and timer2. In this tutorial we will learn how to use an external interrupt in pic microcontroller and whywhere we will need them. Reference manual should be considered a comple mentary. Pic 16f877a microcontroller pin description tutorial. When the peripheral action is enabled in a pin, it may not be used as its general inputoutput functions. The pic microcontroller consists of 8channels, 10bit analog to digital converter. The pic microcontroller contains a processor, memory and inputoutput ports, and the program is stored in flash rom memory in numbered locations. Programming a pic microcontroller page 10 of 24 the last window in the project wizard is a summary of the options you have selected. Pic oscillator frequency is divided by 4 and then fed to the controller, now this this freq can be further divided by presacalar to generate the range of. Project overview the project created using the pic 16f877a is a binary decimal coded bcd clock which is a variation of a binary clock.

The p16f877a stores a maximum of 8096 14bit instructions in flash rom, has 368 bytes of ram and five ports 33 io pins. This is a part of the sequence of pic tutorials in which we started learning pic microcontrollers from scratch. The microcontroller can also generatemeasure the required time delays by running loops, but the timer relieves the cpu from that redundant and repetitive task, allowing it to allocate maximum processing time for other tasks. Every physical quantity found in nature like temperature, humidity, pressure, force is analog. One of the main advantages is that it can be writeerase as many times as possible because it uses flash memory technology. These timer module terminals are also multiplexed with other functions for handling alternate functions. The quintessential pic microcontroller pdf free download. Mclr is used during programming, mostly connected to programmer like pickit.

The pic16f877a features 256 bytes of eeprom data memory, self programming, an icd, 2 comparators, 8 channels of 10bit analogtodigital ad converter, 2 capturecomparepwm functions, the synchronous serial port can be configured as either 3wire serial peripheral interface spi or the 2wire interintegrated circuit i. The five inputoutput ports and its functions are given below. Pic16f877a microcontroller based projects list pic. In this tutorial we are going to discuss the timer module of pic16f877a. Timers and counters are important as timers can tell the time and count. This is the second lecture in pic microcontrollers lecture series. Pic microcontroller introduction the real name of this microcontroller is picmicro peripheral interface controller, but it is better known as pic. If everything looks ok hit finish to create the project. Introduction, pin diagram, pin description, features.

Counting and timing allows for controlling the brightness of leds, controlling the angle of servo shafts and pwm signal generation etc. Difference between microprocessor and microcontroller. Pic16f877a architecture pic microcontrollers part 2. This part of the pic16f877 tutorial focuses on inputoutput ports and tris. The main features of pic microcontrollers are ram, flash memory, timers counters, eeprom, io ports, usart, ccp capturecomparepwm module, ssp, comparator, adc analog to digital converter, psp parallel slave port, lcd and icsp in circuit serial programming the 8bit pic microcontroller is classified into four types on the basis of. Pic16f877a microcontroller introduction and features.

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. You can see its specifications and download the datasheet here. It has five ports on it starting from port a to port e. If trisa port pin is set to 1,corresponding port a pinwill act as an input pin and vice versa. Since it follows the risc architecture, all single cycle instructionstake only one instruction cycle except for program branches which take two cycles. The purpose of this book is not to make a microcontroller expert out of you, but to make. Pic 16f877a is a microcontroller manufactured by microchip inc. Pic 16f877a has five io ports a total of 33 pins are used for io operations. This tutorial will help you learn and use timers in pic microcontroller. The first parts of the family were available in 1976. This article is a part of our tutorial on pic16f877, where this section focuses on the inputoutput ports and tris registers of pic16f877. In our previous tutorials, we had started with introduction to pic and mplabx ide, then we wrote our first pic program to blink the led using pic and then made a led blinking sequence by using delay function in pic microcontroller.

Learn about pic16f877a pic series microcontroller with its introduction, pinout, pin description and a detailed overview of pic16f877a features with its pdf datasheet to download. Pic microcontroller architecture working and application. Here you will find an introduction to pic microcontrollers, theoretical background, and ideas for projects. For demonstration we will use the commonly available pic 16f877a microcontroller. Other port a pins in this microcontroller multiplexed with analog inputs and. You can download pic16f877a datasheet by clicking here. Functional description of pic16f877a functions and. It resets the microcontroller and is active low, meaning. Timers of pic microcontroller how to generate delay. As the name suggests these are used to measure the time or generate the accurate time delay. This microcontroller is very convenient to use, the coding or programming of this controller is also easier. Pic usually pronounced as pick is a family of microcontrollers made by microchip technology, derived from the pic1650 originally developed by general instruments microelectronics division. Pic16f877 timer modules tutorials pic timer0 tutorial.

They are used for comparison of analog signal similar to comparators in electronics circuits. So far we used delay procedure to implement some delay in the program, that was counting up to a specific value, before the program could be continued. After hitting finish you will be presented with a dialog window asking you to save your workspace. We can use these timers for various important purposes. All pic microcontroller family uses harvard architecture. Understanding timers in pic microcontroller with led. Pic16f877tutorialinputouput ports and tris registers. Introduction to pic microcontrollers and its architecture. How to use interrupts in pic microcontroller pic16f877a. Embedded c program to configure the pic microcontroller in gpio mode. This is enough to do many different projects see links at.

A microcontroller is a small and lowcost microcomputer, which is designed to perform the specific tasks of embedded systems like displaying microwaves information, receiving remote signals, etc the general microcontroller consists of the processor, the memory ram, rom, eprom, serial ports, peripherals timers, counters, etc. Read and download ebook lab manual for pic 16f877a microcontroller pdf at public ebook library lab manual for pic 16f87. Give a name to the project and click on next button to save the project. External interrupts, timer interrupts, port state change interrupts, uart interrupt, i2c, pwm interrupts. Although conventionally one thinks of a keyboard and. Its a most commonly used pic microcontroller because of its operational flexibility. Pic microcontrollers the basics of c programming language. The name pic initially referred to peripheral interface controller, and is currently expanded as programmable intelligent computer. The microcontroller uses its ad converter to convert this voltage analogue value to a number digital value which is then sent to the lcd display via several conductors. Features and functions one of the most important feature of the microcontroller is a number of inputoutput pins used for connection with peripherals. If they are 5v then select a 5v mcu some sensors or devices work and communicate on 3. Timer 0 was the first timer developed and you can find it in all the earliest devices e. In this pic timer module tutorial we will study the existing pic timer modules.

Pic16f877a microcontroller provides 8 types of interrupts namley. Video tutorial to use proteus simulation to configure the gpio porta in gpio input mode with the help of trisa direction register. The microcontroller can also generatemeasure the required time delays by running. This produces a single instruction cycle time of 0. Pic 16f877 is one of the most advanced microcontroller from microchip.

In this case, there are in total of thirtyfive general purpose io pins available, which is quite. This microcontroller had small amount of data ram, a few hundred bytes of onchip rom for the program,one. The pic microcontroller pic16f877a is one of the most renowned microcontrollers in the industry. This will be the fifth tutorial in our pic tutorial series, which will help you to learn and use timers in pic16f877a. Pic16f877a introduction, pinout, features, examples, datasheet. Configure gpio in pic16f877a example with proteus simulation. Timer modules in pic16f877 electronic circuits and. Step by step procedure for pic microcontroller programming. Its first ancestor was designed in 1975 by general instruments. C bus and a universal asynchronous receiver transmitter usart. If size and price is a limitation then you can choose small 8pin mcus like pic12f508. After introducing the pic16f877 and its programming, this book covers the fundamental. I use it to control the lighting for the ultraviolet exposure of photosensitive pcb material. Pic16f877a is a 40pin pic microcontroller and is used mostly in embedded projects and applications.

These modules help to perform various timing and counting functions inside the chip. All microcontrollers have clocks in them or they use the one that resides outside of a microcontroller. Understanding timers in pic microcontroller with led blinking. Pic16f877a has three indepenndent timer which can be used as timer,counters or for pwm generation. Pic microcontrollers consist of 3 timers, out of which the timer 0 and timer 2 are 8bit timers and the time1 is a 16bit timer, which can also be used as a counter. Pic16f877a microcontroller interfacing the following figure shows the internal components of a pic16f877a and various types of peripherals which can be connected to it. It has three timers in it, two of which are 8 bit timers while 1 is 16 bit.