Easy PIC Programmer.

This page describe how to make the most easy PIC Programmer.

The Programmer do need external power supply, but it use only one resistor. Programmer ground is also computer ground and the programmer works if bits of the PIC16C84 is connected to the parrallel port at developing. It also works perfect for ISP, but remember the power resistor. By using only one resistor and a 9/25 pol DSUB is it possible to add update facilities of systems with a PIC16C8X using serial port.


   5V power
   |  supply
 R| |100 ohm
  | |0.5W
| VDD |PIC16C84
|     |
|     |
| MCLR|------- TxD (2)
|     |
|     |   +--- DTR (20)
|     |   |
| RB7 |---+--- CTS (5)
|     |  
| RB6 |------- RTS (4)
|     |
|     |        To serial
| GND |        interface
   +---------- GND (7)
   |  power
   0V supply
The build in clamp diodes limits the input voltage, but when using the clamp diodes may the PIC16C84 latch up. Resistor R minimizes risc of latch up. And it also protect the PIC16C84 against too high currents inside which minimalize latch-up possibility.

The RS232 outputs is current limited, and it do typical not exceed +/- 15mA. PIC's handle up to +/- 20mA. Current in the clamping diodes may cause latch up and to prevent this effect do we need the resistor R to reduce the current from power supply. The typical current is about 3 to 4 mA, and the voltage drop on 0.4V is ok. The maximum current is 50mA, as also protect the PIC if it is wrong inserted.

Download PIP-02 beta driver, JDM84V31.ZIP (5K).
Download PIC16C84 utilities, PGM84V28.ZIP (25K).
Download utilities, PICUTIL3.ZIP (46K).
The utilities is inclusive source.

Extra lowcost for PIC16C84 only.
Simple programmer for PIC16C84 and 24Cxx only.



How to make a processor with the delay between instructions less than a half nano second in standard 1u CMOS. (GHz instruction frequence.)

Z80 trick: Use RESET, NMI and CLOCK to bootload a romless system (RAM only).

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