PIC18F4520 Mini Development Board – Overview

The PIC18F4520 Mini Development Board from rhydoLABZ can be used to evaluate and demonstrate the capabilities of Microchip PIC18F4520 microcontrollers. The board is designed for general purpose applications and includes a variety of hardwares to exercise microcontroller peripherals.Ideally suitable for training and development purposes.

Key Features:

Compact and Ready to use
Professional EMI/RFI Complaint PCB Layout for Noise Reduction
High Quality Two layer PTH PCB
Board supports PIC16F877A, PIC18F4550, PIC18F4580 series
No separate power adapter required (USB power source)
External power supply ranges from 7V to 12V Adapter (any standard 9-12V power supply)option
RS-232 and CP2102 Interface (for direct connection to PC’s serial port)
On board two line LCD display(2×16)
On board Reset button
Built in potentiometer interface for ADC
On board Temperature Sensor Interface
On board Buzzer Interface
On board JTAG connector for Debugging/Programming
On board ICSP connector
On board 20 MHz crystal oscillator
On board DB9 connector and USB connector
On board interface to CAN bus
There is a provision for interface Zigbee
There is a provision for interface RFID
There is a provision for interface Servo motor
There is provision for adding mini bread board ,if needed.
Male and Female berg strip to access port pins

PIC18F4520 Chip Specifications

Only 35 single-word instructions to learn
High-current sink/source 25 mA/25 mA
Three programmable external interrupts
Four input change interrupts
Up to 2 Capture/Compare/PWM (CCP) modules, one with Auto-Shutdown (28-pin devices)
Enhanced Capture/Compare/PWM (ECCP) module (40/44-pin devices only)
- One, two or four PWM outputs
- Selectable polarity
- Programmable dead time
- Auto-Shutdown and Auto-Restart
Master Synchronous Serial Port (MSSP) module supporting 3-wire SPI™ (all 4 modes) and I2C™ Master and Slave Modes
Enhanced Addressable USART module:
- Supports RS-485, RS-232 and LIN 1.2
- RS-232 operation using internal oscillator block (no external crystal required)
- Auto-Wake-up on Start bit
- Auto-Baud Detect
10-bit, up to 13-channel Analog-to-Digital Converter module (A/D):
- Auto-acquisition capability
- Conversion available during Sleep
Dual analog comparators with input multiplexing
Four Crystal modes, up to 40 MHz
4X Phase Lock Loop (available for crystal and internal oscillators)
Two External RC modes, up to 4 MHz
Two External Clock modes, up to 40 MHz
Internal oscillator block:
- 8 user selectable frequencies, from 31 kHz to 8 MHz
- Provides a complete range of clock speeds from 31 kHz to 32 MHz when used with PLL
- User tunable to compensate for frequency drift
Secondary oscillator using Timer1 @ 32 kHz
Fail-Safe Clock Monitor:
- Allows for safe shutdown if peripheral clock stops
C compiler optimized architecture:
- Optional extended instruction set designed to optimize re-entrant code
100,000 erase/write cycle Enhanced Flash program memory typical
1,000,000 erase/write cycle Data EEPROM memory typical
Flash/Data EEPROM Retention: 100 years typical
Self-programmable under software control
Priority levels for interrupts
8 x 8 Single-Cycle Hardware Multiplier
Extended Watchdog Timer (WDT):
- Programmable period from 4 ms to 131s
Single-supply 5V In-Circuit Serial
Programming™ (ICSP™) via two pins
In-Circuit Debug (ICD) via two pins
Wide operating voltage range: 2.0V to 5.5V
Programmable 16-level High/Low-Voltage Detection (HLVD) module:
- Supports interrupt on High/Low-Voltage Detection
Programmable Brown-out Reset

The following figures illustrate the peripheral features of the board:

ICSP (K10) – Connector for programming
SW (RESET) – Reset switch
Power LED – Glows when the board is powered
LED – 3 x On-board SMD LED s
SWITCH – 3 x On-board switches
J18(Power jumper) – To select power source as USB/DC source
J3,J4 – To select programming source as serial port/USB port

K15 – Connector for accessing UART 5V
K14 – Connector for accessing CAN
K16 – Connector for interfacing Servo Motor at RE1
J16 – Connects Potentiometer to RA0
J17 – Connects Temperature Sensor to RA1
J1,J2,J10 – Jumpers connects LEDs to port pins RB1, RB2 & RB3
K17 – Connector for accessing UART 3V3
J8,J9,J15 – Jumpers connects Switches to port pins RC3, RC2 & RB5
J20,J21 – Jumpers connects Zigbee Rx & Tx
J19 – Jumper connect Buzzer to RE0
K9 – Connector for Power supply
J6,J7 – Connects CAN TX , CAN RX to CAN Controller (MCP 2551)
LCD – 16 pin Berg strip connector for LCD having jumpers J11 to J14 (default 8 bit mode)

LayoutPowering

PIC18F4520 Board can be powered in 3 ways :

Through an RMC connector (7V – 12V External DC Power Supply)
Through the motherboard USB port
Through a Barrel jack connector (7V – 12V External DC Power Supply)

The supply source can be selected as DC/USB using the jumper (J18). If DC source is selected, then either DC Barrel Jack or RMC connector can be used and the supply voltage should be in the range of 7-12 V. Once the board is powered, the power LED(red LED on the board) glows.

How to test ?

Mini USB and Serial Cable can be used for programming PIC18F4520 Mini Development Board. When USB cable is connected to the PIC18F4520 board, Power LED(Red) on the top of mini development board glows, which shows the power indication.

Coding is done in MPLAB IDE(Download) . Basic steps after installation are mentioned below.

Step 1: Launch MPLAB IDE
Step 2: The MPLAB IDE window opens as shown below
Step 3: To create a new project, select Project >Project Wizard from menu
Step 4: Click next on the Project Wizard window

Step 5: The following window opens. Select PIC18F4520 from the drop-down list and click ‘Next‘
Step 6: The following window open. Select HI-TECH Universal ToolSuite as compiler, check the Toolsuite Contents are the same as shown below ,else select and click ‘Next‘

Note:

To write a program in assembly language, select Microchip MPASM Tool-suite and to write a program in C, select HI-TECH Universal TOOLSuite.
If a cross marking is shown on the left side of the tool contents, then select that particular tool and browse its corresponding .exe file at the location path provided and click ‘NEXT’ to continue.

Step 7: Go for Browse, Save the project in a suitable location with appropriate name
Step 8: Click Next to the following window open.
Step 9: Click Finish to the following window open.Thus create a project with project name ‘Sample‘.
Step 10: Create a new file either by clicking the New File icon,or by selecting File > New or using keyboard shortcut CTRL + N
Step 11: Save the file in the appropriate folder by File >Save as or by save icon
Step 12: Thus save the file with .c extension
Step 13: Now type the code in the c file
Step 14: Add the c file to the project by right click over the Source files and select
Step 15: From the following window select the proper c file and click ‘open‘
Step 16: Thus add the c file
Step 17: Now compile the code by selecting Project <Build or Build with compiler icon as shown below.Errors(if any)get listed in the Build output window.Correct them and build again.
Step 18: To Specify ROM ranges, select Project >Build Options…>Project>Global>ROM ranges from menu. Type the ROM ranges as shown below . Then click Apply and OK.
Step 19: The controller can be flashed either via Pickit2 or serially. If you are using Pickit2, then you should select the proper configuration bits ( you can skip step19 for serial programming). Select configure> configuration bits…uncheck the option Configuration bits set in code. You can set the bits as shown below. After selecting proper configuration, check the option Configuration bits set in code and build the code.
Step 20: On successful building, the hex file will be generated in the project folder. And output window will be as shown below.
Step 21: Now the code can be flashed to the controller.
On the board, make sure to do the following jumper connections
- Select the power source as USB cable or DC source.
- Select USB or serial port for flashing the code.
Now power up the board. The power LED on the board glows. Open Tiny Bootloader(Download),
Step 22: Open the Tiny Bootloader
Step 23: Load/Browse the required hex file. A window opens as shown below.

Step 24: Select the required hex file and click ‘Open’. Select the correct COM port recognized by PC and if its more than COM5 change it to any any lower COM port in Device Manager and select suitable baud rate.
Step 25: Click Write Flash(in Tiny bootloader) and simultaneously press Reset button in the on-board mini development board. After successfully flashing the code, use controller for the desired purpose.