Difference between revisions of "PIC programmer: High voltage"

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[[image:74hct14.gif|right|thumb|74HCT14]]
 
[[image:74hct14.gif|right|thumb|74HCT14]]
 
[[image:16f870.gif|right|thumb|PIC 16F870]]
 
[[image:16f870.gif|right|thumb|PIC 16F870]]
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[[image:16F870test.gif|thumb|left|Test circuit]]
  
 
High-voltage parallel port programmer
 
High-voltage parallel port programmer
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<br>
 
<br>
  
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Load the test program [http://www.sciencezero.org/download/electronics/16F870.HEX "16F870.HEX"]
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#Load the test program [http://www.sciencezero.org/download/electronics/16F870.HEX "16F870.HEX"]
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Set "Config" to 3F71
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#Set "Config" to 3F71
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Click "Program"
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#Click "Program"
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#A LED between GND and RB0-RB7 will show flashing at different frequencies
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A LED between GND and RB0-RB7 will show flashing at different frequencies:
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[[image:16F870test.gif|thumb]]
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The source code is here: [http://www.sciencezero.org/download/electronics/16F870.asm "16F870.asm"]
 
The source code is here: [http://www.sciencezero.org/download/electronics/16F870.asm "16F870.asm"]

Revision as of 23:01, 1 February 2007

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
Test circuit

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)

Settings1.gif


Click "Setup" and change to these settings. It is important that you remember to click "Apply".

Settings2.gif


Click "Define/Test" and change to these settings. It is important that you remember to click "Apply".







  1. Load the test program "16F870.HEX"
  2. Set "Config" to 3F71
  3. Click "Program"
  4. A LED between GND and RB0-RB7 will show flashing at different frequencies

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

Reference

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