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PIC18F452 8-bit PIC Microcontroller

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PIC18F452 is an 8-bit with 10 MIPS, CMPS, FLASH-based microcontroller that has 34 I/O pins out of 40 Pin packages. It is a powerful microcontroller with one 8-bit and three 16-bit timers, 8-Channels 10-bit Analog-digital converter, and I2C, SPI, USART peripheral. It is a Low power microcontroller unit that consumes about less than 0.2 uA standby current and 1.6mA normal current during 5V and 4 Mhz operations.

 

PIC18F452 Pin Configuration

Pin Number

Pin Name

Description

1

MCLR/VPP

Master Clear (input) or High voltage ICSP programming enable pin mainly used for programming purposes.

2

 RA0/AN0

Bidirectional I/O pin of Port A bit 0 or Analog input 0

3

RA1/AN1

Bidirectional I/O pin of Port A bit 1 or Analog input 1

4

RA2/AN2/VREF-

Bidirectional I/O pin of Port A bit 2 or Analog input 2 or A/D Reference (Low) Voltage.

5

RA3/AN3/VREF+

Bidirectional I/O pin of Port A bit 3 or Analog input 3 or A/D Reference (High) Voltage.

6

RA4/T0CKI

Bidirectional I/O pin of Port A bit 4 or Timer 0 external clock input.

7

RA5/AN4/SS/LVDIN

Bidirectional I/O pin of Port A bit 5 or Analog input 4 or SPI Slave Select input or Low voltage Detect input.

8

RE0/RD/AN5

Bidirectional I/O pin of Port E bit 0 or Read control for parallel slave port or Analog input 5

9

RE1/WR/AN6

Bidirectional I/O pin of Port E bit 1 or Write control for parallel slave port or Analog input 6

10

RE2/CS/AN7

Bidirectional I/O pin of Port E bit 2 or Chip select control for parallel slave port or Analog input 7.

11

VSS

Positive supply pin.

12

VDD

Ground supply pin.

13

OSC1/CLKI

Oscillator Crystal or External clock input.

14

OSC2/CLKO/RA6

Bidirectional I/O pin of Port A bit 6 or Oscillator crystal or clock output.

15

RC0/T1OSO/T1CKI

 

Bidirectional I/O pin of Port C bit 0 or Timer 1 Oscillator output or Timer 1/Timer 3 external clock input. 

16

RC1/T1OSI/CCP2

 

Bidirectional I/O pin of Port C bit 1 or Timer 1 Oscillator input or Capture 2 input, Capture 2 output, PWM 2 output.

17

RC2/CCP1

Bidirectional I/O pin of Port C bit 2 or Capture 1 input, Capture1 output, PWM1 output

18

RC3/SCK/SCL

Bidirectional I/O pin of Port C bit 3 or Synchronous serial clock input/output for SPI mode or Synchronous serial clock input/output for 12C mode.

19

RD0/PSP0

 

Bidirectional I/O pin of Port D bit 0 or Parallel slave Port Data

20

RD1/PSP1

Bidirectional I/O pin of Port D bit 1 or Parallel slave Port Data.

21

RD2/PSP2

Bidirectional I/O pin of Port D bit 2 or Parallel slave Port Data

22

RD3/PSP3

Bidirectional I/O pin of Port D bit 3 or Parallel slave Port Data

23

RC4/SDI/SDA

Bidirectional I/O pin of Port C bit 4 or SPI Data In or 12C data I/O.

24

RC5/SDO

Bidirectional I/O pin of Port C bit 5 or SPI Data Out.

25

RC6/TX/CK

Bidirectional I/O pin of Port C bit 6 or USART Asynchronous Transmit or USART Synchronous Clock

26

RC7/RX/DT

  

Bidirectional I/O pin of Port C bit 7 or USART Asynchronous Receive or USART Synchronous Data

27

RD4/PSP4

Bidirectional I/O pin of Port D bit 4 or Parallel slave Port Data

28

RD5/PSP5

Bidirectional I/O pin of Port D bit 5 or Parallel slave Port Data

29

RD6/PSP6

Bidirectional I/O pin of Port D bit 6 or Parallel slave Port Data

30

RD7/PSP7

Bidirectional I/O pin of Port D bit 7 or Parallel slave Port Data

31

VSS

Ground Supply pin

32

VDD

Positive supply pin

33

RB0/INT0

Bidirectional I/O pin of Port B bit 0 or External Interrupt 0.

34

RB1/INT1

Bidirectional I/O pin of Port B bit 1 or External Interrupt 1.

35

RB2/INT2

Bidirectional I/O pin of Port B bit 2 or External Interrupt 2.

36

RB3/CCP2

Bidirectional I/O pin of Port B bit 3 or Capture 2 input, Compare 2 output, PWM 2 output.

37

RB4

 

Bidirectional I/O pin of Port B bit 4 with IOC (Interrupt-on-change)

38

RB5/PGN

Bidirectional I/O pin of Port B bit 5 with IOC (Interrupt-on-change) or Low Voltage ICSP programming enable pin

39

RB6/PG

Bidirectional I/O pin of Port B bit 6 with IOC (Interrupt-on-change) or In-Circuit Debugger and ICSP programming clock pin.

40

RB7/PGD

Bidirectional I/O pin of Port B bit 7 with IOC (Interrupt-on-change) or In-Circuit Debugger and ICSP programming data pin.

 

Features and Specification of the PIC18F452 Microcontroller

PIC18F452 - Simplified Features and Specification

CPU

8-bit

Number of Pins

40

Operating Voltage (V)

2-5.5 V

Number of I/O pins

34

ADC Module

1 (8-Channels, 10-bits)

Timer Module

8-bit(1), 16-bit(3)

Comparators

0

DAC Module

0

Communication Peripherals

SPI, I2C, UART

External Oscillator

Yes

Internal Oscillator

No

Program Memory (KB)

32KB

CPU Speed (MIPS)

10

RAM Bytes

1536 byte

Data EEPROM

256 byte

 

Note: Complete technical details can be found in the 18F452 Datasheet linked at the bottom of this page.

 

Alternative product of PIC18F452

Alternative products for PIC18F452 microcontroller are listed below-

  1. PIC12F629
  2. PIC12F683
  3. PIC16F505
  4. PIC12F508
  5. PIC16F676
  6. PIC16F72
  7. PIC16F873A
  8. PIC16F876A
  9. PIC16F886
  10. PIC16F252

 

Introduction to PIC18F452

PIC18F452 is an 8-bit with 10 MIPS, CMPS, FLASH-based microcontroller that has 34 I/O pins out of 40 Pin packages. It is a powerful microcontroller with one 8-bit and three 16-bit timers, 8-Channels 10-bit Analog-digital converter, and I2C, SPI, USART peripheral. It is a Low power microcontroller unit that consumes about less than 0.2 uA standby current and 1.6mA normal current during 5V and 4 Mhz operations.

 

PIC18F452 also has the feature of Programming code protection, Power-on Reset (POR), Power-up Timer (PWRT), Oscillator Start-up timer with power saving sleep mode. The watchdog timer features its own On-Chip RC Oscillator for reliable operations. 2V to 5.5V operating voltage makes the 18F452 suitable for 3.3V and 5.0V logic level operations. Below image is showing the pin diagram of PIC18F452-

PIC18F452 Pin Diagram

 

Detailed Features of PIC18F452

PIC18F452 –Detailed Features

CPU

8-bit

Architecture

8-bit

Program Memory Size (Kbytes)

32 KB

RAM (bytes)

1536 bytes

EEPROM/HEF

256 byte

Pin Count

40

Max. CPU Speed (MHz)

40MHz

Peripheral Pin Select (PPS)

No

Internal Oscillator

No

No. Of comparators

Nil

No. Of  Operational Amplifier

Nil

No. Of ADC channels

8

Max ADC Resolution (bits)

10-bits

ADC with Computation

No

Number of DAC Converter

Nil

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

No

Hardware Limit Timer

No

No. Of PWM outputs

2

Max PWM resolution

8-bit

Angular Timer

No

Math Accelerator

No

No. Of  UART module

1

No. Of SPI Module

1

No. Of I2C module

1

No. Of USB Module

Nil

Windowed Watchdog Timer (WWDT)

No

CRC/Scan

No

Numerically Controlled Oscillator

No

Cap. Touch Channels

Nil

Segment LCD

No

Minimum Operating Temperature (*C)

-40°C

Maximum Operating Temperature (*C)

125°C

Minimum Operating Voltage (V)

2V

Maximum Operating Voltage (V)

5.5 V

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 PIC18F452 is given below.

PIC18F452 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 PIC18F452

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 PIC18F452 are shown below-

PIC18F452 Dimensions

Component Datasheet

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