Contents
How to write input pin to output pin?
Writing 1 (High) to a single bit of the TRISx register configures the pin corresponding to this bit to be an input pin. Writing 0 (Low) to a single bit of the TRISx register configures the pin corresponding to this bit to be an output pin.
Can a microcontroller use a crystal oscillator?
A microcontroller that uses an external crystal has the oscillator circuitry built-in on the chip. You can also build your own oscillator to make this work with a crystal. 2) There is a three-terminal active component (sometimes it may come with more than three leads) called a crystal oscillator.
What kind of pins are used in a microcontroller?
In fact, most of the pins in a typical microcontroller are GPIO pins except for some special pins. The special (non-GPIO) pins are usually the following ones: OSCillator pins: OSC1 & OSC2. Those couple of pins are used to provide the MCU with the oscillator clock input it needs. MCLR: the master clear reset pin.
How can I change the logical state of an input pin?
After configuring any i/o pin, you’ll be able to read its state (if it’s an input pin) or to change its logical state (if it’s an output pin). Here the function of PORTx register comes in, as the value we write to that register specifies the logical state of the corresponding pins (High 1/ Low 0).
How to control the I / O port on a PIC?
Controlling or driving the I/O port is a pretty easy process. It involves only two consecutive steps. Configure The Pin, determine the data direction, whether it’s an Input or Output Read / Write. If the pin is configured to be an input pin, then you’ll be reading (polling) its state several times within your program.
Where are the GPIO pins located on a PIC?
As shown below from the PIC16F877A datasheet, the GPIO pins are clustered in PORTs. As you may have noticed that the pins [2 to 7] are named [RA0 to RA5] and that’s why this is called “PORTA“. In our MCU there are 5 digital Input/output ports [A, B, C, D, and E].