Very Simple ICSP Programmer

[Squibcakes]

Originally posted by toreto
which of this two is conected to the resitor?
PGD = 7
PGC = 6
thanks for your answer

Both are connected through 4.7k resistors, as well as the vpp through a 4.7k resistor.


GP0 = GPD = 7
GP1 = GPC = 6

So in your case you would connect the 12Cxxx chip like this:

D-Conn............................uPIC
TXD (3) ------[4.7k]-------VPP(pin 4)

GND (5) --------------------VSS(pin 8)

DTR (4) -------[4.7k]------DATA(pin 7)

CTS (8) ------------------DATA(pin 7)

RTS (7) -------[4.7k]------CLK(pin 6)

5 volts DC to VDD(pin1)

Hope this helps.
J

[Nimrod]

Both are connected through 4.7k resistors, as well as the vpp through a 4.7k resistor.


GP0 = GPD = 7
GP1 = GPC = 6

So in your case you would connect the 12Cxxx chip like this:

D-Conn............................uPIC
TXD (3) ------[4.7k]-------VPP(pin 4)

GND (5) --------------------VSS(pin 8)

DTR (4) -------[4.7k]------DATA(pin 7)

CTS (8) ------------------DATA(pin 7)

RTS (7) -------[4.7k]------CLK(pin 6)

5 volts DC to VDD(pin1)

Hope this helps.
J

I've tried to make this programmer but somehow I can't program the 12C508a, here is what happends:

I can read the PIC with no problems in ICprog but when I press the program button it gives me an error on 0000h I've checked the Voltage and I have 5V between GND and VCC as expected (I'm powering the programmer through USB since it gives 5V) and between GND and VPP I have -10V without the PIC placed in the socket ofc...its a bit strange to have a value so low isn't it? Can anyone please help me I'm getting crazy with this already screwed 3 PICS...can read them but cant write Thnx

[mister_e]

10V is way too low, this have to be ~13V. This kind of programmer is really not recommended anyways.. worst if you use a USB to Serial converter.

There's few variant of such cheap programmer like JDM, JDM2, Taits, Ludipo, ElCheapo, PicBlaster and the list is long... none of those seems to work properly... even worst with Vista

I've been told the parrallel PIC programmer in the list above work better... BUT ANYWAY...invest ~40$ and buy yourself a real Microchip PICKit 2 or a clone like JuneBug.

and huh.. why not using 12F508 wich is a flash version.. so you can write on it again and again... and again.

[mister_e]

Yet another reason why you should consider PICKit2. Along with it's ICD capability, EEPROM, Keeloq and device programming list, The standalone application give you USART tool (no need for MAX232)... AND NOW, the new V2.50 add this nifty 3 channel LogicAnalyser (logic signal stimulus and monitoring) tool... for free!

As if wasn't enough... >>>PICkit 2 Programmer-To-Go support for programming devices without a PC.<<<

http://www.microchip.com/stellent/id...cName=en023805

How about that?

~40$ for that... even if you don't use it as a daily/main programmer... only the free tools worth it no? I really like the Programmer-To-Go option....

[Ramonetnet]

Can you update the schematic to be used with 18F452 ?
Ramon.

[Ramonetnet]

Here I have a LVP-cable, very similar to yours ...

>>> http://home.vrweb.de/~lotharstolz/st...vpc/index.html

It does NOT work for me, and my RS-232 provides 10 volts.

Is this a problem ?
I thought LVP got "L" from "LOW" voltage, only 5 volts all around.
Am I wrong ?

The resistors here are 10 K, whilst yours are 4K7. Is this important ?
I see 2 mA shall flow in your circuit, and only 1 mA in the LOTHAR desing ...

[Leccy-Lee]

Forgive me for dragging an old topic, but i found this thread via Google and am new to the forum ( HI )..

I am trying to get this to work on a PIC16F88, it was posted that it worked fine but i have been trying for hours.

I have no experience of PICs at all, and all i am simply trying to do is build a design i got online that comes with the .hex firmware already. I simply need to get this firmware onto the PIC and away i can go.

Have read the datasheet for the pic, and about ICSP in circuit, and read this topic 3-4 times now. Heres how i have it so far, but i think its wrong?

9pin serial 16F88 pin
------------- ------------
3 4.7k 4 (vpp/mclr)
5 -- 5 (Grd)
4 4.7k 13 (Data ? PGD)
8 -- 12 (Data ? PGC)
7 4.7k ?? (which port?)

Then i use my circuits 5v to supply 5v to vdd, i measured my PC serial port on pin 3 as 10v, is that enough or is that my problem? I see in datasheet about low-voltage programming is an option but wasn't sure how to connect that up?

I have then tried both Ic-Prog and Winpic to "upload" the .hex firmware to my pic (still in circuit but connected as above) but neither seems to be working? Cant even tell if its connecting to the pic? In Winpic it says "failed to initialise programmer" and in Ic-Prog it just fails on verify. I have set both softwares to programmer "JDM" type as instructed.

Where am i going wrong, and what are the correct pins and settings for PIC16F88 please?

[shottootto]

Hi
I am completely new to PIC, so please excuse if this is stupid.
For Stand-alone(not in-circuit) I understand that to transfer a program I need approx 12V on VPP and this has to be connected after 5V to VDD.
Can I use an external power supply for both voltages and make the VPP 12V switched in by the VDD 5v via a transistor, can it work or is VPP switched during transfer?

So I will then only have these between PC and PIC

GND (5) --------------------VSS

DTR (4) -------[4.7k]------DATA
- |
CTS (8) -----------------

RTS (7) -------[4.7k]------CLK

If it can work, then surely it will solve the laptop and USB-232 adapter problems.
Ps. I know I can buy a programmer, but I want to build one. This is why I ask.

Will appreciate your help.