COURS DE MICROCONTROLEUR PIC 16F84 PDF

It seem like it is the ancestor of all the PIC micro-controllers. The essential steps are:. For writhing the program we can use Embedded C compiler. Any of the port line can be configured to be an input or output. PIC16F84 has a inbuilt precision timing system called as Timers. An 8-bit number uniquely represents each alphanumeric key on a PC.

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Start on. Show related SlideShares at end. WordPress Shortcode. Homoud Alsohaibi , Member Follow. Published in: Engineering. Full Name Comment goes here. Are you sure you want to Yes No. No Downloads. Views Total views. Actions Shares. Embeds 0 No embeds. No notes for slide. Pic16f84 1. First and the most important is its functionality. In order for a microprocessor to be used, other components such as memory, or components for receiving and sending data must be added to it. In short that means that microprocessor is the very heart of the computer.

No other external components are needed for its application because all necessary peripherals are already built into it. Module Code and Module EE Its general structure is shown on the following map representing basic blocks. Intel's and Motorola's microcontrollers have over hundred instructions All of these instructions are executed in one cycle except for jump and branch instructions. SMD is an abbreviation for Surface Mount Devices suggesting that holes for pins to go through when mounting, aren't necessary in soldering this type of a component.

One ceramic capacitor of 30pF whose other end is connected to the ground needs to be connected with each pin. Oscillator and capacitors can be packed in joint case with three pins. Center pins of the element is the ground, while end pins are connected with OSC1 and OSC2 pins on the microcontroller. When designing a device, the rule is to place an oscillator nearer a microcontroller, so as to avoid any interference on lines on which microcontroller is receiving a clock. Resonant frequency of RC oscillator depends on supply voltage rate, resistance R, capacity C and working temperature.

It should be mentioned here that resonant frequency is also influenced by normal variations in process parameters, by tolerance of external R and C components, etc. That practically means that microcontroller can behave rather inaccurately under certain undesirable conditions. In order to continue its proper functioning it has to be reset, meaning all registers would be placed in a starting position. Reset is not only used when microcontroller doesn't behave the way we want it to, but can also be used when trying out a device as an interrupt in program execution, or to get a microcontroller ready when loading a program.

Resistor should be between 5 and 10K. This kind of resistor whose function is to keep a certain line on a logical one as a preventive, is called a pull up. That part is responsible for finding and fetching the right instruction which needs to be executed, for decoding that instruction, and finally for its execution.

Moving data inside a register is also known as 'shifting'. PIC16F84 contains an 8-bit arithmetic logic unit and 8-bit work registers. Memory organization PIC16F84 has two separate memory blocks, one for data and the other for program. Program memory Program memory has been carried out in FLASH technology which makes it possible to program a microcontroller many times before it's installed into a device, and even after its installment if eventual changes in program or process parameters should occur.

The size of program memory is locations with 14 bits width where locations zero and four are reserved for reset and interrupt vector. EEPROM memory consists of 64 eight bit locations whose contents is not lost during loosing of power supply. GPR registers can be accessed regardless of which bank is selected at the moment.

These are called Special Function Registers. Program counter and stack Program Counter Program counter PC is a bit register that contains the address of the instruction being executed.

It is physically carried out as a combination of a 5-bit register PCLATH for the five higher bits of the address, and the 8-bit register PCL for the lower 8 bits of the address. By its incrementing or change i. Stack PIC16F84 has a bit stack with 8 levels, or in other words, a group of 8 memory locations, 13 bits wide, with special purpose.

Its basic role is to keep the value of program counter after a jump from the main program to an address of a subprogram. In order for a program to know how to go back to the point where it started from, it has to return the value of a program counter from a stack. Any access to SFR registers is an example of direct addressing.

This is a very important part, because it provides connection between a microcontroller and environment which surrounds it. Generally, each interrupt changes the program flow, interrupts it and after executing an interrupt subprogram interrupt routine it continues from that same point on.

TMR0 interrupt caused by timer overflow 3. PUSH and POP are instructions with some other microcontrollers Intel , but are so widely accepted that a whole operation is named after them.

This is an important part of the program which programmer must not forget, or program will constantly go into interrupt routine. Through their application it is possible to establish relations between a real dimension such as "time" and a variable which represents status of a timer within a microcontroller. Physically, timer is a register whose value is continually increasing to , and then it starts all over again: 0, 1, 2, 3, If interrupts are allowed to occur, this can be taken advantage of in generating interrupts and in processing interrupt routine.

It is up to programmer to reset T0IF bit in interrupt routine, so that new interrupt, or new overflow could be detected. If this option of external clock was selected, it would be possible to define the edge of a signal rising or falling , on which timer would increase its value. The most important characteristic of this memory is that it does not lose its contents with the loss of power supply. Cycles of calling and executing instructions are connected in such a way that in order to make a call, one instruction cycle is needed, and one more is needed for decoding and execution.

However, due to pipelining, each instruction is effectively executed in one cycle. If instruction causes a change on program counter, and PC doesn't point to the following but to some other address which can be the case with jumps or with calling subprograms , two cycles are needed for executing an instruction. This is so because instruction must be processed again, but this time from the right address. Cycle of calling begins with Q1 clock, by writing into instruction register IR. Decoding and executing begins with Q2, Q3 and Q4 clocks.

The first represents a set of rules used in writing a program for a microcontroller, and the other is a program on the personal computer which translates assembly language into a language of zeros and ones. A program that is translated into "zeros" and "ones" is also called "machine language". Its main advantage over macro is that this set of instructions is placed in only one location of program memory. Label ; subprogram is called with "call Label" set of instructions set of instructions set of instructions return or retlw Module Code and Module EE They come in different sizes and with different purposes.

Buttons that are used here are also called "dip-buttons". They are soldered directly onto a printed board and are common in electronics. They have four pins two for each contact which give them mechanical stability.

When we push a button, two contacts are joined together and connection is made. Still, it isn't all that simple. The problem lies in the nature of voltage as an electrical dimension, and in the imperfection of mechanical contacts.

That is to say, before contact is made or cut off, there is a short time period when vibration oscillation can occur as a result of unevenness of mechanical contacts, or as a result of the different speed in pushing a button this depends on person who pushes the button. When the transistor is activated, the voltage between collector and emitter falls to 0. If optocoupler LED is connected to microcontroller pin, logical zero on pin will activate optocoupler LED, thus activating the transistor.

This will consequently switch on LED in the part of device working on 12V. Layout of this connection is shown below. To have the beeper started, it needs to be delivered a string in binary code - in this way, you can create sounds according to your needs. Connecting the beeper is fairly simple: one pin is connected to the mass, and the other to the microcontroller pin through a capacitor, as shown on the following image.

The common line the common-cathode line is taken out separately and this line is taken low for a short period of time to turn on the display.

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PIC16F84 Microcontroller

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Become a subscriber Free Join 29, other subscribers to receive subscriber sale discounts and other free resources. Name : E-Mail : Don't worry -- youre-mail address is totally secure. I promise to use it only to send you MicroZine. The PIC16F84 is a the most well known and most well used of all the PIC microcontrollers - it is used in numerous projects that you can find across the web. Even though the 16F84 is getting on a bit, it is one of the most popular of the PIC microcontrollers and there are hundreds of circuits for it on the web but it does have limited memory, RAM and peripherals See diagram below.

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PIC16F84 Introduction

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