Re: ISP issues

At 00:33 28/02/2004 -0500, Brian Dean wrote:
>On Fri, Feb 27, 2004 at 11:10:44PM -0500, David Willmore wrote:
>
> > I'm trying to program a large number of 90S2313s, so
> > I knocked up a ZIF socket to a 6 pin header and put
> > in a little power supply.
> >
> > I tested the wiring and it seems to be right, but
> > neither of the ISP capable programmers I have--
> > STK500 and an AVRisp--seems to want to touch it.
> > They read back the target voltage just fine, but
> > fail to go into program mode.
> >
> > Is there anything special that needs to be in the
> > target for an ISP programmer to work?  Pullup
> > resistors or anything?
> >
> > I used a VOM to verify that my fixture matches
> > the connections in the STK500 on the Vcc, GND,
> > RESET, SCK, MISO, and MOSI pins.  Do I need anything
> > else?
>
>Clock source - crystal, resonator, external clock or something.  I
>don't think the AT90S2313's have a built-in oscillator.

You're right Brian.  These old devices need a clock source in order to be 
programmed.  David, solder a ceramic resonator or crysal onto that socket 
and all will be well.

Cheers,

Jason Kyle



>-Brian
>--
>Brian Dean, [email protected]
>BDMICRO - MAVRIC & MAVRIC-II ATmega128 Based Dev Boards
>http://www.bdmicro.com/
>
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