14CORE Microchip PIC18F2550 8Bit Minimal Development Board Microcontroller w/d USB Pin

This is the 14CORE PIC18F2550 Minimal Development Board with an input voltage of 4.5v to 21v that can be used in your projects or production purpose, the board has a size of 22X49mm suitable for small and medium size electronic projects. The PIC18F2550 is an 8-bit microcontroller from Microchip It has a maximum CPU speed of 48 MHz and is built on an enhanced flash-based 8-bit RISC architecture. The PIC18F2550 comes in a 28-pin package, making it ideal for applications with space constraints. here are som key features of this microcontroller.

Flash Program Memory: 32K bytes
Data Memory (SRAM): 2K bytes
Operating Voltage: 2.0V to 5.5V
Maximum Speed: 48 MHz
Number of I/O Pins: 22
Analog Inputs: 13
PWM Outputs: 5
Timers: 3

This PIC18F2550 microcontroller is equipped with features like USB support, multiple communication interfaces, and a range of on-chip peripherals such as timers, PWM outputs, and analog-to-digital converters (ADCs). It also has a large flash program memory of 32K bytes and a data memory (SRAM) of 2K bytes and is commonly used in a variety of applications, including industrial automation, consumer electronics, and automotive applications. It can be programmed using high-level languages like C or assembly language, and it can be powered by a DC power supply or battery with an input voltage range of 2.0V to 5.5V.

This 14CORE PIC18F2550 microcontroller can be programmed using a variety of programming languages, including C, assembly language, and other high-level languages. Microchip provides a free Integrated Development Environment (IDE) called MPLAB X IDE, which includes a compiler, an assembler, and a debugger for programming PIC microcontrollers. MPLAB X IDE supports C language programming, and it includes a set of libraries and APIs (Application Programming Interfaces) for interacting with the on-chip peripherals and communication interfaces of the PIC18F2550.

To program the PIC18F2550 microcontroller using MPLAB X IDE, you will need to have a programming device like a PICkit programmer or an ICSP (In-Circuit Serial Programming) programmer. These devices connect to the microcontroller through the programming header on the microcontroller board, and they allow you to load the compiled program code into the microcontroller’s flash program memory.

The programming process typically involves the following steps:

Write your program code in C or assembly language using MPLAB X IDE.
Compile your program code using the MPLAB X IDE compiler.
Use a programmer device to connect to the PIC18F2550 microcontroller board through the programming header.
Load the compiled program code into the microcontroller’s flash program memory using the MPLAB X IDE programmer interface.

Schematics Diagram:

Requirements & Parts List:

Part	Value	Device	Package

C1,C2,C4	100nF	Ciramic Capacitor	0805
C3	1uF	Electrolytic Capacitor	0806
C7, C8	22uF	Electrolytic Capacitor	0807
C9	1uF	Electrolytic Capacitor	0808
D1	PMEG6020AELRX	Schottky Diode	SODFL3517X110N
D2, D3,D4	KPT-1608ZGC	SMD LED, Red, Green	LED_KPT-1608ZGC
IC1	PIC18F2550-I_SO	Microcontroller	SOIC127P1030X265-28N
IC4	MPM3610GQV-P	Regulator	MPM3610GQVP
R1, R2	27 Ohms	Resistor	0402
R3	10K	Resistor	0603
R4,R5,R6	330 Ohms	Resistor	0603
R7, R12	100K	Resistor	0402
R11	39K	Resistor	0403
R13	19K	Resistor	0404
S1	TL1015AF160QG	Push Button	SW_TL1015AF160QG
U4	AP2112K-3.3TRG1	Regulator	SOT95P285X140-5N
Y1	CSTCE9M00G55-R0	Resonator	OSC_CSTCE9M00G55-R0

Input Output and Registers Pins :

ANSEL and ANSELH are registers on the PIC18F2550 microcontroller that control the analog input channels.

The ANSEL register (ANalog SELect) controls the analog inputs AN0 through AN7. Each bit in the ANSEL register corresponds to an analog input channel, and setting a bit to 1 enables the analog input function for that channel. When a bit is cleared (set to 0), the corresponding channel is configured as a digital input/output.

The ANSELH register controls the analog inputs AN8 through AN13. It functions in a similar way to ANSEL, with each bit corresponding to an analog input channel. However, since there are only six analog input channels on ANSELH, the remaining two bits are reserved for other functions.

The ANSEL and ANSELH registers allow the PIC18F2550 to selectively enable or disable the analog input function for each channel, which can save power and reduce noise in digital systems where analog inputs are not required. These registers are commonly used in applications where the microcontroller needs to interface with analog sensors or other analog devices.

ANSEL
7	6	5	4	3	2	1	0
ANS7	ANS6	ANS5	ANS4	ANS3	ANS2	ANS1	ANS0

ANSELH
7	6	5	4	3	2	1	0
X	X	X	X	ANS11	ANS10	ANS9	ANS8

Configuration Example :

ANSEL = 0b10000001;	//AN7 and AN0 enabled
ANSELH = 0b00000101;	//AN8 and AN10 enabled

Or we could use hex by:

ANSEL = 0x81;	//AN7 and AN0 enabled
ANSELH = 0x05;	//AN8 and AN10 enabled

ANSEL = 0b10000001; //AN7 and AN0 enabled

ANSELH = 0b00000101; //AN8 and AN10 enabled

Or we could use hex by:

ANSEL = 0x81; //AN7 and AN0 enabled

ANSELH = 0x05; //AN8 and AN10 enabled

TRISA, TRISB, and TRISC are registers on the PIC18F2550 microcontroller that control the direction of the I/O pins in Port A, Port B, and Port C respectively.

The TRISA register (TRIState A) controls the direction of the I/O pins in Port A. Each bit in the TRISA register corresponds to an I/O pin in Port A. When a bit is set to 1, the corresponding pin is configured as an input, and when a bit is cleared (set to 0), the corresponding pin is configured as an output.

Similarly, the TRISB register (TRIState B) controls the direction of the I/O pins in Port B, and the TRISC register (TRIState C) controls the direction of the I/O pins in Port C. Each bit in these registers corresponds to an I/O pin in the respective port.

By setting the bits in these registers, the programmer can configure the microcontroller’s I/O pins as either inputs or outputs. This allows the microcontroller to interface with external devices such as sensors, actuators, and displays.

In summary, the TRISA, TRISB, and TRISC registers are used to set the direction of the I/O pins in Port A, Port B, and Port C, respectively, and are an essential part of configuring the PIC18F2550 for interfacing with external devices.

TRISA
7	6	5	4	3	2	1	0
X	X	TRISA5	TRISA4	TRISA3	TRISA2	TRISA1	TRISA0

TRISB
7	6	5	4	3	2	1	0
TRISB7	TRISB6	TRISB5	TRISB4	X	X	X	X

TRISC
7	6	5	4	3	2	1	0
TRISC7	TRISC6	TRISC5	TRISC4	TRISC3	TRISC2	TRISC1	TRISC0

Configuration Example :

TRISA = 0b00110000;	//RA5 and RA4 are digital inputs, the rest are outputs
TRISB = 0b10010000;	//RB7 and RB4 are digital inputs, RB6 and RB5are outputs
TRISC = 0b00010001;	//RC4 and RC0 are digital inputs, the rest are outputs

Keep in mind that any analog pins must be disabled using the ANSEL and ANSELH registers before they can be used as digital I/O. Pin RA3, which is shared with MCLR, is an input only. Therefore, writing to bit 3 of TRISA will have no effect. Reading bit 3 will always return a 1, as RA3 is input only.
For example, if you want to use RC0 as a digital output pin you would first have to make sure the ANSEL bit for AN4 was disabled. This is required because it shares a pin with RC0.
ANSELbits.ANS4 = 0;	//disable AN4

TRISCbits.TRISC0 = 0;	//RC0 is a digital output

In addition it is a common mistake to set the ANSEL and ANSELH registers incorrect or to forget to set them at all. If you having issues with a digital pin, check ANSEL and ANSELH. bits of ANSEL and ANSELH default to '1' on power on. If you do not set these registers in your code, all the analog pins will be enabled. Therefore, no digital pins that share an analog pin will function correctly. Always set ANSEL and ANSELH.

TRISA = 0b00110000; //RA5 and RA4 are digital inputs, the rest are outputs

TRISB = 0b10010000; //RB7 and RB4 are digital inputs, RB6 and RB5are outputs

TRISC = 0b00010001; //RC4 and RC0 are digital inputs, the rest are outputs

Keep in mind that any analog pins must be disabled using the ANSEL and ANSELH registers before they can be used as digital I/O. Pin RA3, which is shared with MCLR, is an input only. Therefore, writing to bit 3 of TRISA will have no effect. Reading bit 3 will always return a 1, as RA3 is input only.

For example, if you want to use RC0 as a digital output pin you would first have to make sure the ANSEL bit for AN4 was disabled. This is required because it shares a pin with RC0.

ANSELbits.ANS4 = 0; //disable AN4

TRISCbits.TRISC0 = 0; //RC0 is a digital output

In addition it is a common mistake to set the ANSEL and ANSELH registers incorrect or to forget to set them at all. If you having issues with a digital pin, check ANSEL and ANSELH. bits of ANSEL and ANSELH default to '1' on power on. If you do not set these registers in your code, all the analog pins will be enabled. Therefore, no digital pins that share an analog pin will function correctly. Always set ANSEL and ANSELH.

PORTA, PORTB, and PORTC are registers on the PIC18F2550 microcontroller that control the state of the I/O pins in Port A, Port B, and Port C, respectively.

The PORTA register controls the state of the I/O pins in Port A. Each bit in the PORTA register corresponds to an I/O pin in Port A. When a bit is set to 1, the corresponding pin is driven high (VDD), and when a bit is cleared (set to 0), the corresponding pin is driven low (VSS).

Similarly, the PORTB register controls the state of the I/O pins in Port B, and the PORTC register controls the state of the I/O pins in Port C. Each bit in these registers corresponds to an I/O pin in the respective port.

By writing to the bits in these registers, the programmer can set the state of the microcontroller’s I/O pins as either high or low. This allows the microcontroller to drive external devices such as LEDs, motors, and relays.

In summary, the PORTA, PORTB, and PORTC registers are used to set the state of the I/O pins in Port A, Port B, and Port C, respectively, and are an essential part of configuring the PIC18F2550 for interfacing with external devices.

PORTA
7	6	5	4	3	2	1	0
X	X	RA5	RA4	RA3	RA2	RA1	RA0

PORTB
7	6	5	4	3	2	1	0
RB7	RB6	RB5	RB4	X	X	X	X

PORTC
7	6	5	4	3	2	1	0
RC7	RC6	RC5	RC4	RC3	RC2	RC1	RC0

ANSELHbits.ANS11 = 0;	//Disable AN11 shared with RB5
TRISBbits.TRISB5 = 0;	//RB5 is a digital output
PORTBbits.RB5 = 1;	//Set on the output

you can also set RB4 to be a digital input and read it:

ANSELHbits.ANS10 = 0;	//Disable AN10 shared with RB4
TRISBbits.TRISB4 = 1;	//RB4 is a digital input

if(PORTBbits.RB4 == 1)		//Read RB4 and compare it to 1
	PORTBbits.RB5 = 1;	//if 1, turn on the output
else
	PORTBbits.RB5 = 0;	//if not, turn off the output

ANSELHbits.ANS11 = 0; //Disable AN11 shared with RB5

TRISBbits.TRISB5 = 0; //RB5 is a digital output

PORTBbits.RB5 = 1; //Set on the output

you can also set RB4 to be a digital input and read it:

ANSELHbits.ANS10 = 0; //Disable AN10 shared with RB4

TRISBbits.TRISB4 = 1; //RB4 is a digital input

if(PORTBbits.RB4 == 1) //Read RB4 and compare it to 1

PORTBbits.RB5 = 1; //if 1, turn on the output

else

PORTBbits.RB5 = 0; //if not, turn off the output

Test Code :

void main(void)
{
    TRISB = 0x00; //Set to use register TRISB
    PORTB = 0x00; //Set to use PORTB IO
    while(1)
    {
        PORTB = 0xFF; //Set IO enable 
        __delay_ms(50); //Delay 50 milliseconds
        PORTB = 0x00; //Set IO disable
        __delay_ms(50); //Delay 50 milliseconds
    }
    return;
}

void main(void)

{

TRISB = 0x00; //Set to use register TRISB

PORTB = 0x00; //Set to use PORTB IO

while(1)

{

PORTB = 0xFF; //Set IO enable

__delay_ms(50); //Delay 50 milliseconds

PORTB = 0x00; //Set IO disable

__delay_ms(50); //Delay 50 milliseconds

}

return;

}

MPLab Test Code :

#include <xc.h>
#define _XTAL_FREQ 4000000
#pragma config FOSC=INTRCIO, WDTE=OFF, PWRTE=OFF, MCLRE=ON, CP=OFF, \
                CPD=OFF, BOREN=OFF, IESO=OFF, FCMEN=OFF

int main()
{
    TRISA = 0xFF;
    TRISB = 0xFF;
    TRISC = 0xFF;

    ANSEL = 0x00;
    ANSELH = 0x00;

    TRISBbits.TRISB7 = 0;
    while(1)
    {
        PORTBbits.RB7 = 1; //Set IO enable 
        __delay_ms(500); // Delay 50 milliseconds
        PORTBbits.RB7 = 0; //Set IO disable
        __delay_ms(500); // Delay 50 milliseconds
    }

    return 0;
}

#include <xc.h>

#define _XTAL_FREQ 4000000

#pragma config FOSC=INTRCIO, WDTE=OFF, PWRTE=OFF, MCLRE=ON, CP=OFF, \

CPD=OFF, BOREN=OFF, IESO=OFF, FCMEN=OFF

int main()

{

TRISA = 0xFF;

TRISB = 0xFF;

TRISC = 0xFF;

ANSEL = 0x00;

ANSELH = 0x00;

TRISBbits.TRISB7 = 0;

while(1)

{

PORTBbits.RB7 = 1; //Set IO enable

__delay_ms(500); // Delay 50 milliseconds

PORTBbits.RB7 = 0; //Set IO disable

__delay_ms(500); // Delay 50 milliseconds

}

return 0;

}

Download PCB Milling File | 14CORE PIC18F2550
Download Gerber Viewer | Windows | Linux

Downloads :

Download PIC18F2550 Datasheet | PDF
Download PIC18F2550 Technical | PDF
Download MPM3610 Step-Down Converter
with Integrated Inductor | PDF
Download AP2112K-3.3 Regulator |PDF

14CORE Microchip PIC18F2550 8Bit Minimal Development Board Microcontroller w/d USB Pin

The programming process typically involves the following steps:

Schematics Diagram:

Requirements & Parts List:

Input Output and Registers Pins :

Configuration Example :

Configuration Example :

Test Code :

MPLab Test Code :

Downloads :

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