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
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.
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
74HCT14
PIC16F870
David Tait's Flash PIC Programme (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"