PIC18F4520 8-bit PIC Microcontroller

24 August 2020 - 0 Comments

PIC18F4520 8-bit PIC Microcontroller

PIC18F4520 Pinout

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	0^th pin of PORTA or Analog pin 0
3	RA1 / AN1	1^st pin of PORTA or Analog pin 1
4	RA2 / AN2 / VREF- / CVREF	2^nd pin of PORTA or Analog pin 2 or A/D reference voltage(low) input or Comparator reference voltage output
5	RA3 / AN3 / VREF+	3^th pin of PORTA or Analog pin 3 or A/D reference voltage (high) input
6	RA4 / T0CKI / C1OUT	4^th pin of PORTA or Timer0 external clock input or Comparator 1 output
7	RA5 / AN4 / SS / HLVDIN / C2OUT	5^th 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	0^th pin of PORTE or Read control for Parallel Slave Port or Analog pin 5
9	RE1 / WR / AN6	1^st pin of PORTE or Write control for Parallel Slave Port or Analog pin 6
10	RE2 / CS / AN7	2^nd 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	7^th pin of PORTA or Oscillator crystal or external clock input
14	OSC2 / CLKO / RA6	6^th pin of PORTA or Oscillator crystal or external clock output
15	RC0 / T1OSO / T13CKI	0^th pin of PORTC or Timer1 oscillator output or Timer1/Timer3 external clock input
16	RC1 / T1OSI / CCP2	1^st pin of PORTC or Timer1 oscillator input or Capture 2 input / Compare 2 output / PWM2 output
17	RC2 / CCP1 / P1A	2^nd pin of PORTC or Capture 1 input / Compare 1 output / PWM1 output or Enhanced CCP1 output
18	RC3 / SCK / SCL	0^th pin of PORTC or Serial Clock In/Out for SPI & I2C
19	RD0 / PSP0	0^th pin of PORTD or Parallel Slave Port data
20	RD1 / PSP1	1^st pin of PORTD or Parallel Slave Port data
21	RD2 / PSP2	2^nd pin of PORTD or Parallel Slave Port data
22	RD3 / PSP3	3^th pin of PORTD or Parallel Slave Port data
23	RC4 / SDI / SDA	4^th pin of PORTC or SPI data in or I2C data in/out
24	RC5 / SDO	5^th pin of PORTC or SPI data out
25	RC6 / TX / CK	6^th pin of PORTC or USART asynchronous transmit or USART synchronous clock
26	RC7 / RX / DT	7^th pin of PORTC or USART asynchronous receive or USART synchronous data
27	RD4 / PSP4	4^th pin of PORTD or Parallel Slave Port data
28	RD5 / PSP5 / P1B	5^th pin of PORTD or Parallel Slave Port data or Enhanced CCP1 output.
29	RD6 / PSP6 / P1C	6^th pin of PORTD or Parallel Slave Port data or Enhanced CCP1 output.
30	RD7 / PSP7 / P1D	7^th 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	0^th pin of PORTB or External interrupt 0 or PWM Fault input for Enhance CCP1 or Analog pin 12
34	RB1 / INT1 / AN10	1^st pin of PORTB or External interrupt 1 or Analog pin 10
35	RB2 / INT2 / AN8	2^nd pin of PORTB or External interrupt 2 or Analog pin 8
36	RB3 / AN9 / CCP2	3^th pin of PORTB or Analog pin 9 or Capture 2 input / Compare 2 output / PWM2 output
37	RB4 / KBI0 / AN11	4^th pin of PORTB or Interrupt-on-Change pin or Analog pin 11
38	RB5 / KBI1 / PGM	5^th pin of PORTB or Interrupt-on-Change pin or Low-Voltage ICSP™ Programming enable
39	RB6 / KBI2 / PGC	6^th pin of PORTB or Interrupt-on-Change pin or In-Circuit Debugger and ICSP programming data pin.
40	RB7 / KBI3 / PGD	7^th 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.