PIC programmer: High voltage

PIC HV-programmer schematics
12V - Not critical, must be at least 3.5V above Vdd.
5V - Must be regulated.
Q1 - Most small signal transistors will work.
C1 - Not critical, decouples both the PIC and the 74HCT14.
R1-R3 - Not critical.
74HCT14 - Must be a HCT part.

74HCT14

PIC 16F870

High-voltage parallel port programmer

This programmer works on Flash based PIC microcontrollers. It is based on a design by David Tait but uses schmitt triggers as buffers for improved stability.

• 16F628
• 16F870 - tested
• 16F873
• 16F874
• 16F876
• 16F877

The parallel cable should be as short as possible, it did work on a 1.5 metre extension cable but should be tested with a short cable

Programming Software

David Tait's Flash PIC Programmer (FPP) Mirror: - fpp09.zip (183 KB)

Click "Setup" and change the settings to:

Click "Define/Test" and change the settings to:

remember to click "Apply"!!!

Load the test program "16F870.HEX" Set "Config" to 3F71 Click "Program"

A LED between GND and RB0-RB7 will show flashing at different frequencies:

The source code is here: "16F870.asm"

Reference

• Byron Jeff's PIC Page
• Trivial HVP Programmer
• David Tait's Flash PIC Programmer software
• WinPic800 programmer software