If you can, slow the data write rate. This has proved a successful fix 
several times with other Atmel avr's.

Hul


feilip <feilip@gmail.com> wrote:
> Hi,
> 
> I use internal clock (default).
> 
> My connection is as follow:
> 
> pin on parallel port || ATiny12 pin 
> 6 || 7 (Sck) 
> 7 || 5 (MOSI) 
> 9 || 1 (RESET) 
> 10 || 6 (MISO) 
> 
> I didn't connect the XTAL1 and XTAL2 pins since the fuse bit of the
> ATiny12 chip is set to use the Interal clock (default). I also have a
> 10k resistor connected between VDD and reset.
> 
> The strange thing is that I can read and erease the chip but not write
> on it.
> 
> Many thanks.
> feilip
> 
> larwe@larwe.com (Lewin A.R.W. Edwards) wrote in message news:<608b6569.0408251639.7fd8a1a7@posting.google.com>...
>> > I am trying to use PonyProg and the AVR ISP (STK200/300) parallel port
>> > interface to program an Atmel Tiny12 chip. However, I wouldn't be able
>> 
>> Does the chip have a clock source? If this is a fresh factory chip, it
>> will. If it has been used before, it may be configured for an external
>> clock mode, which requires that you supply a clock signal.

Hi,

I use internal clock (default).

My connection is as follow:

pin on parallel port || ATiny12 pin 
6 || 7 (Sck) 
7 || 5 (MOSI) 
9 || 1 (RESET) 
10 || 6 (MISO) 

I didn't connect the XTAL1 and XTAL2 pins since the fuse bit of the
ATiny12 chip is set to use the Interal clock (default). I also have a
10k resistor connected between VDD and reset.

The strange thing is that I can read and erease the chip but not write
on it.

Many thanks.
feilip

larwe@larwe.com (Lewin A.R.W. Edwards) wrote in message news:<608b6569.0408251639.7fd8a1a7@posting.google.com>...
> > I am trying to use PonyProg and the AVR ISP (STK200/300) parallel port
> > interface to program an Atmel Tiny12 chip. However, I wouldn't be able
> 
> Does the chip have a clock source? If this is a fresh factory chip, it
> will. If it has been used before, it may be configured for an external
> clock mode, which requires that you supply a clock signal.

> I am trying to use PonyProg and the AVR ISP (STK200/300) parallel port
> interface to program an Atmel Tiny12 chip. However, I wouldn't be able

Does the chip have a clock source? If this is a fresh factory chip, it
will. If it has been used before, it may be configured for an external
clock mode, which requires that you supply a clock signal.

Hi,

I am trying to use PonyProg and the AVR ISP (STK200/300) parallel port
interface to program an Atmel Tiny12 chip. However, I wouldn't be able
to program it and I got a 'Write error (-21)' error message from
PonyProg. I look at the SCK, MOSI, MISO, and RESET pins and they all
have signals. Does anyone have this problem before?

By selecting AT90S2313, the same setup will program an Atmel AT90S2313
chip.

Thanks,
feilip