PIC18F4520: Digital Inputs - Revision history

LIMS: /* Sample Code */

2007-07-05T14:15:19Z

Sample Code

← Older revision		Revision as of 09:15, 5 July 2007
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	First include header file with definitions for specific PIC.		First include header file with definitions for specific PIC.
	Set fuses. HS is type of external clock, low voltage ~~protection~~		Set fuses. HS is type of external clock, low voltage programming
	(LVP) is off, and the watchdog timer (WDT) is off.		(LVP) is off, and the watchdog timer (WDT) is off.
	External clock frequency of 20 MHz is specified.		External clock frequency of 20 MHz is specified.

LIMS: /* Digital Inputs Example */

2007-06-29T20:02:06Z

Digital Inputs Example

← Older revision		Revision as of 15:02, 29 June 2007
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	[[Image:4520pindiagramdigital.jpg\|center]]		[[Image:4520pindiagramdigital.jpg\|center]]
	==Digital Inputs Example==		==Digital Inputs Example==
			This section uses an example to describe how to set up and read digital inputs using a PIC18F4520.
	===Sample Code===		===Sample Code===
	Program to display push-button input as LED output		Program to display push-button input as LED output

LIMS at 20:00, 29 June 2007

2007-06-29T20:00:36Z

← Older revision		Revision as of 15:00, 29 June 2007
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			Working with digital inputs and outputs is fundamental to circuit design, and PIC microcontrollers add versatility to design by allowing programming and re-programming of the logic associated with input and output pins. In this way, one PIC microcontroller can take the place of many pre-programmed digital logic ICs.
	==Available Pins==		==Available Pins==
	With the exception of the positive voltage supply and ground pins, all pins on the PIC18F4520 can be used as digital I/O, however a few other pins (shown in grey below) are commonly utilized for communication instead of digital I/O.		With the exception of the positive voltage supply and ground pins, all pins on the PIC18F4520 can be used as digital I/O, however a few other pins (shown in grey below) are commonly utilized for communication instead of digital I/O.

LIMS: /* Circuit Diagram */

2007-06-29T18:46:07Z

Circuit Diagram

← Older revision		Revision as of 13:46, 29 June 2007
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	===Circuit Diagram===		===Circuit Diagram===
	[[Image:~~Digitalinckt~~.jpg]]		[[Image:Digitalinckt2.jpg]]

LIMS: /* Circuit Diagram */

2007-06-29T18:45:55Z

Circuit Diagram

← Older revision		Revision as of 13:45, 29 June 2007
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	===Circuit Diagram===		===Circuit Diagram===
	[[Image:~~digitalinckt~~.jpg]]		[[Image:Digitalinckt.jpg]]

LIMS at 14:35, 28 June 2007

2007-06-28T14:35:52Z

← Older revision		Revision as of 09:35, 28 June 2007
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	<br><br>		<br><br>
	[[Image:4520pindiagramdigital.jpg\|center]]		[[Image:4520pindiagramdigital.jpg\|center]]
			==Digital Inputs Example==
			===Sample Code===
			Program to display push-button input as LED output

			First include header file with definitions for specific PIC.
			Set fuses. HS is type of external clock, low voltage protection
			(LVP) is off, and the watchdog timer (WDT) is off.
			External clock frequency of 20 MHz is specified.

			#include <18f4520.h>
			#fuses HS,NOLVP,NOWDT
			#use delay (clock=20000000)

			Define pin names to be used in the main program. See header file
			for currently defined pin names.

			#define IN0 PIN_B0
			#define IN1 PIN_B1
			#define IN2 PIN_B2
			#define OUT0 PIN_D0
			#define OUT1 PIN_D1
			#define OUT2 PIN_D2

			Begin main body of program.

			void main(void) {

			Use while to set up infinite loop.

			while(TRUE){

			Check each input pin and define action to be taken depending on
			reading from input (in this case, set the output to the input).

			if(input(IN0))
			output_high(OUT0);
			else if (!input(IN0))
			output_low(OUT0);
			if(input(IN1))
			output_high(OUT1);
			else if (!input(IN1))
			output_low(OUT1);
			if(input(IN2))
			output_high(OUT2);
			else if (!input(IN2))
			output_low(OUT2);}
			}
			<br>

			===Circuit Diagram===
			[[Image:digitalinckt.jpg]]

LIMS: /* Available Pins */

2007-06-28T14:25:09Z

Available Pins

← Older revision		Revision as of 09:25, 28 June 2007
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	==Available Pins==		==Available Pins==
	With the exception of the positive voltage supply and ground pins, all pins on the PIC18F4520 can be used as digital I/O, however a few other pins (shown in grey below) are commonly utilized for communication instead of digital I/O.		With the exception of the positive voltage supply and ground pins, all pins on the PIC18F4520 can be used as digital I/O, however a few other pins (shown in grey below) are commonly utilized for communication instead of digital I/O.
			<br><br>
			[[Image:4520pindiagramdigital.jpg\|center]]

LIMS at 14:21, 28 June 2007

2007-06-28T14:21:53Z

New page

==Available Pins==
With the exception of the positive voltage supply and ground pins, all pins on the PIC18F4520 can be used as digital I/O, however a few other pins (shown in grey below) are commonly utilized for communication instead of digital I/O.