Microchip manufacture a sequence of microcontrollers called PIC. It is controlled by software and programmed in the manner to perform several tasks. There are so many types of microcontrollers available, and some of them are low memory type. These microcontrollers are almost economical, functional and simple to discover. As compare to different microcontrollers like Arduino Uno which are a little expensive and consists of development boards.
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Microchip manufacture a sequence of microcontrollers called PIC. It is controlled by software and programmed in the manner to perform several tasks. There are so many types of microcontrollers available, and some of them are low memory type. These microcontrollers are almost economical, functional and simple to discover.
As compare to different microcontrollers like Arduino Uno which are a little expensive and consists of development boards. But if you do not want to spend much for your project, a single chip pic micro would be perfect for getting you started.
PIC18F is a readily available, amazing, and calm competent microcontroller which can help you to add some logic and Intel to your projects. PIC16F84A microcontroller is a very famous pic microcontroller. You may like to check pic microcontroller tutorials. This is an 18 pin IC, the description of each pin are given below:.
These 13 GPIO pins can be independently configured either as digital input or as digital output. Also, each pin can either supply or can absorb a maximum of 25mA current per pin. So, accordingly, every pin can drive a LED easily but cannot drive any dc motor or relays. Because, current requirement for LED is generally less than 10mA and dc motor requires greater than 25mA.
If you want to interface relay or dc motor, you have to use current driver ICs. Each of these pins source and sinks 25mA current. With little careful, you can program the microcontroller deprived of eliminating it from the target board for example in-circuit. It contains 64 bytes memory that is mainly used to store data and 1K program memory specifies the capacity of code you can burn inside.
Watchdog timer: This microcontroller has built-in Watchdog timer. There is an internal timer located under the chip. You can make this timer enable or disable by programming. The timer is mainly used to rest the microcontroller when the program goes wrong or it may enter to the infinite loop.
Registers: There are two types of registers which are as follow here. Timer : PIC16F84a contains one 8-bit timer that can be utilized in both ways i. Furthermore, accompanies internal and external clock select capability. Sleep Mode: This mode is included the chip that produces a low current power down mode. The sleep mode can be removed using an interrupt, external reset, and watchdog timer. Power on Reset: This feature is utilized in various other PIC microcontrollers when it is powered on.
If there arises a problem in the chip, powering on the device will dismiss it from the loop of any malfunctioning in the device. This is also used in Central heating projects, Production of the temperature data logger, and gas sensor projects. Also used in security systems and setting up serial communication with other devices. The code written in the compiler creates a hex record that is transferred on the PIC Microcontroller.
Before accessing any register during the time of programming or program writing, you must need to select the particular bank which contains that register. Handling banks may be steep if you write the code in assembly language.
Flash Memory: This consist of Flash memory based on 8-bit microcontroller packs. The same microcontroller device can be used for prototyping and production. This circuit is designed with proteus. We can use proteus for simulation of microcontrollers. But if you have no idea about Mikro C for pic and did not use it before.
This register is used to define GPIO pins either as a digital input or output. Both these registers are bit addressable. For example, if you want to define RB0 pin as digital output pin, Follow command will declare RB0 as a digital output pin. Initializing any pin with zero using TRISX register will declare it a digital output and if you initialize it as with 1, it will declare it as pin as a digital input pin like this:.
Now, if you want to make digital pin logical HIGH, you simply assign it as value 1 and otherwise 0. Like following examples. Connection diagram is shown here. RB0 pin is used to read external interrupts. Microcontroller keep executing its sequential code and based on the request of interrupt, it will turn on the LED and after it receive interrupt again, it will turn off the LED.
Interrupt will occur on positive edge. But it can configured for negative edge also. Notify me of follow-up comments by email. Notify me of new posts by email. Table of Contents.
Introduction to PIC16F84a
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.
The Microchip PIC series of microcontrollers have several sources of hardware interrupts. These are RISC microcontrollers with 35 instructions. To configure interrupts or other hardware functions are setup by configuring various bits in selected registers, in particular here the INTCOM register. Here I'll start with hardware interrupts, which add incredible power to these low-cost devices. This is a general discussion of hardware interrupts. To enable any interrupt the SET bit 7 to 1 in the interrupt control register.