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In-Circuit PIC Loader using PIC18F458 microcontroller

This loader connects the PC printer port and works with WinPic800. The loader gets DC supply from application board and provides +12V for high voltage programming mode. We can use it for programming many PIC chips easily.

Circuit diagram
Tags: #pic-loader#pic18f458
Ibrar Ayyub By Ibrar Ayyub
Published

At a glance

CategoryProgrammers & ICSP
PIC modelPIC18F458
IncludesCircuit diagram
Reading time~2 min

Summary of In-Circuit PIC Loader using PIC18F458 microcontroller

This article describes an in-circuit PIC loader connecting a PC printer port to program PIC chips using WinPic800. It utilizes a PIC18F458 microcontroller, a DS1820 temperature sensor, and a 20x4 LCD display for a test board. The hardware includes tristate buffers (U1A, U1B) for signal management and an MC3406A DC-to-DC converter to generate the required +12V programming voltage.

Parts used in the In-Circuit PIC Loader:

  • PIC18F458 microcontroller
  • DS1820 temperature sensor
  • 20x4 LCD display
  • Tristate buffer U1A
  • Tristate buffer U1B
  • MC3406A DC-to-DC converter
  • PC printer port interface
  • WinPic800 software

In-Circuit PIC Loader

Hardware Schematic

The In-circuit serial programming for PIC chips requires only three signals, i.e. a bi-directional DATA line (PGD), a synchronize clock (PGC), and a +12V Flash programming voltage (VPP). U1A is a tristate buffer for sending data stream. U1B is for clock stream. Both gates disconnect the signals, PGD and PGC from application board when VDD is turned off. The programming voltage +12V, is generated by DC-to-DC converter, U4 MC3406A. The hardware settings for WinPic800 is compatible with Propic2.

I built the test board with PIC18F458, DS1820 and 20x4 LCD display. Figure 7 shows hardware schematic of the test board. The test program displays temperature from -40C to +150C on LCD. Figure 8 shows code window of PIC18F458.

How to use WinPic800 with PIC loader.

 

For more detail: In-Circuit PIC Loader using PIC18F458 microcontroller

  • How does the loader obtain power?
    The loader gets its DC supply from the application board.
  • What signals are required for In-circuit serial programming?
    It requires a bi-directional DATA line, a synchronize clock, and a +12V Flash programming voltage.
  • Which component generates the +12V programming voltage?
    The DC-to-DC converter U4 MC3406A generates the +12V voltage.
  • Can this loader be used with many PIC chips?
    Yes, it can be used for programming many PIC chips easily.
  • What happens to the PGD and PGC signals when VDD is off?
    Both gates disconnect the signals PGD and PGC from the application board when VDD is turned off.
  • Is the hardware compatible with Propic2?
    Yes, the hardware settings for WinPic800 are compatible with Propic2.
  • What components were used in the test board?
    The test board was built with PIC18F458, DS1820, and a 20x4 LCD display.
  • What temperature range does the test program display?
    The test program displays temperature from minus 40C to plus 150C on the LCD.
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Ibrar Ayyub

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough...