There are many different flavours available, some basic low memory types, going right up through to ones that have Analogue — To- Digital converters and even PWM built in. There are various sizes available, which come with their own costs. The next thing you will need tutrial an assembler. It operates in isolation to the main clock. To start, let us take a look at the PIC. Successful compiles will generate syLed.

Author:Akinokinos Tautaur
Language:English (Spanish)
Published (Last):2 September 2011
PDF File Size:10.77 Mb
ePub File Size:19.97 Mb
Price:Free* [*Free Regsitration Required]

Yes 3. Following are the main functions of PIC16F84a. Timer PIC16F84a contains one 8-bit timer that can be used in both ways i. The timer mode increments the instruction cycle while counter mode will increment the rising and falling edge of the pin.

This module consists of Tx which is a transmission pin used for transmitting serial data to other devices and Rx is a receive pin used for receiving serial data. Watchdog Timer PIC16F84a comes with built-in timer called watchdog timer that can be configured with programming. This timer is mainly used to reset the controller when a program hangs up during compilation or gets stuck in infinite loop of the program.

More or less, watchdog timer works like a countdown timer and starts from and gradually goes down to zero. It must be reset to initial value after every 3 instructions in order to avoid reaching it to zero value in normal conditions. Sleep Mode Power saving sleep mode is added in the chip that generates a low current power down mode. The sleep mode can be removed using an interrupt, watchdog timer or external reset.

Power On Reset This feature is included in most of the PIC controllers that resets the controller when it is powered on. If there comes a glitch in the chip, powering on the device will exclude it from the loop of any malfunctioning in the device. You can download this compiler online from the Microchip Official Site. The code written in the compiler generates a hex file that is uploaded on the PIC Microcontroller.

There are other unofficial burners used for burning the code, however, PICKit3 is mostly preferred and stays ahead of other burners in terms of efficiency and performance.

They are the data holding places in the processor of the controller. A single register can hold storage address, instruction and any kind of data ranging from bit sequence to individual characters.

General purpose registers are used for storing any modified or random value in the processor. While Special function registers monitor and control the various aspect of the processor functions.

Each bank comes with bytes of memory space where first 12 locations are allocated to special function registers while remaining are reserved for general purpose registers that are used as static RAM. This register is mainly used for switching between the banks. Setting fifth bit of this register indicates we targeting bank 1 while resetting it will indicate we are targeting bank 0.

This register decides the possibility if the Port A pins are used as input or output. The value 1 indicates output and value 0 indicates input. W Register. It is accessible by a program and is not a part of any register bank. This model version falls under the family of mid-range microcontroller devices.

The program memory comes with 1K words of memory space which can configure instructions. Some pins in the controller can be interfaced with other device functions including external interrupt, Timer0 clock input and Change on PORTB interrupt. Central heating projects Production of temperature data logger Used in security systems Main part of the embedded system Used in industrial automation Setting up serial communication with other devices 8.

Watching other people proceed and developing many projects with the same interest as yours put you in high inferiority complex. However, with the invention PIC controllers, and similar compact chips, things are not the same as they were a long while ago. PIC controllers are easy to configure and require no or minimum prior skills to get familiar with the complete working of the device. What makes them useful is their ease of use and economical price. Timers, counters, serial communication interface, and so many identical functions can be performed using a single chip.

However, if you are feeling skeptical or have any question you can ask me in the comment section below. You are most welcome to give us your suggestions, they help us provide you quality work so you keep coming back for what we have to offer. Thanks for reading the article.


Using PIC Timer with PIC16F84A

The term "free-running" means it continually runs on the background and has no start or stop control. Other microcontrollers have multiple timers with higher bit numbers: the PIC16FA has two 8-bit and one bit timers while the PIC18F has three bit and one 8-bit timers. Each count elapses after two instruction cycles by default. Recall that the instruction cycle speed is calculated for a 4 MHz oscillator using You can extend the time it takes for each count using prescalers.


The PIC16F84A - A Beginners Microcontroller





ASTM D 3359-02 PDF


Related Articles