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PIC18F4520 8-bit PIC Microcontroller

[Click the image to enlarge it]

PIC18F4520 is a low-cost, low-power, high-speed 8-bit, fully-static Microcontroller unit with 40 pins, 36 of which can be used as I / O pins. It has power-on-reset (POR) and the WDT circuitry (Extended Watchdog Timer), which can be programmed for 4 ms to 131 s.

 

PIC18F4520 Pin Configuration

Pin Number

Pin Name

Description

1

MCLR / VPP / RE3

MCLR[Master Clear (Reset) input] is used during programming, mostly connected to a programmer like PicKit / Programming voltage input or 3rd pin of PORTE

2

RA0 / AN0

0th pin of PORTA or Analog pin 0

3

RA1 / AN1

1st pin of PORTA or Analog pin 1

4

RA2 / AN2 / VREF- / CVREF

2nd pin of PORTA or Analog pin 2 or A/D reference voltage(low) input or Comparator reference voltage output

5

RA3 / AN3 / VREF+

3th pin of PORTA or Analog pin 3 or A/D reference voltage (high) input

6

RA4 / T0CKI / C1OUT

4th pin of PORTA or Timer0 external clock input or Comparator 1 output

7

RA5 / AN4 / SS / HLVDIN / C2OUT

5th pin of PORTA or Analog pin 4 or SPI slave select input or High/Low-Voltage Detect input or Comparator 2 output

8

RE0 / RD / AN5

0th pin of PORTE or Read control for Parallel Slave Port or Analog pin 5

 

9

RE1 / WR / AN6

1st pin of PORTE or Write control for Parallel Slave Port or Analog pin 6

10

RE2 / CS / AN7

2nd pin of PORTE or Chip Select control for Parallel Slave Port or Analog pin 7

11

Vdd

Positive Pin of MCU (+5V)

12

Vss

Ground Pin of MCU

13

OSC1 / CLKI / RA7

7th pin of PORTA or Oscillator crystal or external clock input

14

OSC2 / CLKO / RA6

6th pin of PORTA or Oscillator crystal or external clock output

15

RC0 / T1OSO / T13CKI

0th pin of PORTC or Timer1 oscillator output or Timer1/Timer3 external clock input

16

RC1 / T1OSI / CCP2

1st pin of PORTC or Timer1 oscillator input or Capture 2 input / Compare 2 output / PWM2 output

17

RC2 / CCP1 / P1A

2nd pin of PORTC or Capture 1 input / Compare 1 output / PWM1 output or Enhanced CCP1 output

18

RC3 / SCK / SCL

0th pin of PORTC or Serial Clock In/Out for SPI & I2C

19

RD0 / PSP0

0th pin of PORTD or Parallel Slave Port data

20

RD1 / PSP1

1st pin of PORTD or Parallel Slave Port data

21

RD2 / PSP2

2nd pin of PORTD or Parallel Slave Port data

22

RD3 / PSP3

3th pin of PORTD or Parallel Slave Port data

23

RC4 / SDI / SDA

4th pin of PORTC or SPI data in or I2C data in/out

24

RC5 / SDO

5th pin of PORTC or SPI data out

25

RC6 / TX / CK

6th pin of PORTC or USART asynchronous transmit or USART synchronous clock

26

RC7 / RX / DT

7th pin of PORTC or USART asynchronous receive or USART synchronous data

 

27

RD4 / PSP4

4th pin of PORTD or Parallel Slave Port data

28

RD5 / PSP5 / P1B

5th pin of PORTD or Parallel Slave Port data or Enhanced CCP1 output.

29

RD6 / PSP6 / P1C

6th pin of PORTD or Parallel Slave Port data or Enhanced CCP1 output.

30

RD7 / PSP7 / P1D

7th pin of PORTD or Parallel Slave Port data or Enhanced CCP1 output.

31

Vss

Ground Pin of MCU

32

Vdd

Positive Pin of MCU (+5V)

33

RB0 / IN0 / FLT0 / AN12

0th pin of PORTB or External interrupt 0 or PWM Fault input for Enhance CCP1 or Analog pin 12

34

RB1 / INT1 / AN10

1st pin of PORTB or External interrupt 1 or Analog pin 10

35

RB2 / INT2 / AN8

2nd pin of PORTB or External interrupt 2 or Analog pin 8

36

RB3 / AN9 / CCP2

3th pin of PORTB or Analog pin 9 or Capture 2 input / Compare 2 output / PWM2 output

37

RB4 / KBI0 / AN11

4th pin of PORTB or Interrupt-on-Change pin or Analog pin 11

38

RB5 / KBI1 / PGM

5th pin of PORTB or Interrupt-on-Change pin or Low-Voltage ICSP™ Programming enable

39

RB6 / KBI2 / PGC

6th pin of PORTB or Interrupt-on-Change pin or In-Circuit Debugger and ICSP programming data pin.

40

RB7 / KBI3 / PGD

7th pin of PORTB or Interrupt-on-Change pin or In-Circuit Debugger and ICSP programming data pin.

 

Features and Specification of the PICPIC18F4520 Microcontroller

PIC18F4520 - Simplified Features and Specification

CPU

High performance 8-bit

Number of Pins

40

Operating Voltage (V)

2-5.5V

Number of I/O pins

36

ADC Module

10-bit, 13-channel

Timer Module

1 x 8-bit

3 x 16-bit

Capture/Compare/PWM Peripherals

2 x Capture module

2 x Compare module,

2 x PWM module,

DAC Module

Nil

Communication Peripherals

1 x USART

1 x SPI

1 x I2C

External Oscillator

Up to 40Mhz

Internal Oscillator

8Mhz, 32Khz

Program Memory (KB)

32KB

CPU Speed (MIPS)

10 MIPS

RAM (byte)

1536

Data EEPROM (byte)

256

 

Note: Complete technical details can be found in the PIC18F4520 Datasheet linked at the bottom of this page.

 

Alternative for PIC18F4520:

 

Introduction toPIC18F4520

PIC18F4520 is a low-cost, low-power, high-speed 8-bit, fully-static Microcontroller unit that has 40 pins out of which 36 pins can be used as I/O pins. It has Power-on-Reset (POR) as well as the Extended Watchdog Timer (WDT) circuitry, which can be programmed for 4ms to 131s.

 

It has Power Management Features, which is useful for low-power applications. It has 3 power management modes.

1.    RUN mode

2.    SLEEP mode

3.    IDLE mode

 

PIC18F4520 also comes with 3 programmable external interrupts & 4 Interrupts-On-Change (IOC) pins, which are reliable features for interrupts related applications. Also, the system has a 13-channel 10-bit ADC converter module.

 

It has a wide operating voltage range, from 2V to 5.5V., Thus it can be used in 3.3V or 5.0V logic level operations. The below image is showing the detailed pin diagram of the PIC18F4520.

PIC18F4520 Pin Diagram

 

Detailed Features of PIC18F4520

PIC18F4520 –Detailed Features

CPU

High performance 8-Bit

Architecture

8

Program Memory Size (Kbytes)

32

RAM (bytes)

1536

EEPROM/HEF

256

Pin Count

40

Max. CPU Speed (MHz)

40

Peripheral Pin Select (PPS)

No

Internal Oscillator

8Mhz, 32Khz

No. Of comparators

2

No. Of  Operational Amplifier

0

No. Of ADC channels

13

Max ADC Resolution (bits)

10

ADC with Computation

2

Number of DAC Converter

0

Max DAC resolution

-

Internal Voltage Reference

No

Zero Cross Detect

No

No. Of 8-bit timers

1

No. Of 16-bit Timers

3

Signal Measurement Timer

0

Hardware Limit Timer

0

No. Of PWM outputs

2

Max PWM resolution

10

Angular Timer

0

Math Accelerator

No

No. Of  UART module

1

No. Of SPI Module

1

No. Of I2C module

1

No. Of USB Module

0

Windowed Watchdog Timer (WWDT)

Yes

CRC/Scan

No

Numerically Controlled Oscillator

No

Cap. Touch Channels

0

Segment LCD

0

Minimum Operating Temperature (°C)

-40

Maximum Operating Temperature (°C)

125

Minimum Operating Voltage (V)

2

Maximum Operating Voltage (V)

5.5

High Voltage Capable

No

 

Programming PIC Microcontroller

PIC microcontrollers can be programmed with different software that is available in the market. There are people who still use Assembly language to program PIC MCUs. The below details is for the most advanced and common software and compiler that has been developed by Microchip itself.

 

In order to program the PIC microcontroller, we will need an IDE (Integrated Development Environment), where the programming takes place. A compiler, where our program gets converted into MCU readable form called HEX files. An IPE (Integrated Programming Environment), which is used to dump our hex file into our PIC MCUs.

IDE: MPLABX v3.35

IPE: MPLAB IPE v3.35

Compiler: XC8

 

Microchip has given all these three software for free. They can be downloaded directly from their official page. I have also provided the link for your convenience. Once downloaded, install them on your computer. If you have any problem doing so, you can post them on the comment below.

 

To dump or upload our code into PIC, we will need a device called PICkit 3. The PICkit 3 programmer/debugger is a simple, low-cost in-circuit debugger that is controlled by a PC running MPLAB IDE (v8.20 or greater) software on a Windows platform. The PICkit 3 programmer/debugger is an integral part of the development engineer's tool suite. A basic programming circuit for PIC18F4520 is given below.

PIC18F4520 Programming Circuit

In addition to this, we will also need other hardware like a Perf board or breadboard, Soldering station, PIC ICs, Crystal oscillators, capacitors, etc.

 

Components associated with PIC

PICkit3, PIC Development Board, Crystal Oscillators, Capacitors, 12V Adapter, 7805 Voltage Regulator.

 

Application of PIC18F4520

This is a basic Mid-range 8-bit microcontroller unit that can be used in the following applications- 

1.    Input-Output operations

2.    Control Applications

3.    Analog data Processing

4.    Sensors integration and data logging

5.    Small scale, low cost embedded application based production

 

2D Model

The dimensions of the PIC18F4520 are shown below-

PIC18F4520 Dimensions

Component Datasheet

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