Hi,
I used the circuit suggested by Flash Magic Software.
According to this connection , I communicated( i.e Programmed the P89c61x2bn) once, afterthat i switched off the circuit.
Now I tried to communicate it , I got the "Unable to communicate" Error display.
Pls. kindly suggess on this.
with thanks,
Sathish
After reviewing your debug file:
The device is not entering ISP mode. Can you please use a scope to check RST and PSEN. PSEN should be low at the falling edge of RST. /EA should be at +5V and ALE should be floating or high.
Andy
Quote from: Andy Ayre on June 26, 2007, 09:11:46 AM
After reviewing your debug file:
The device is not entering ISP mode. Can you please use a scope to check RST and PSEN. PSEN should be low at the falling edge of RST. /EA should be at +5V and ALE should be floating or high.
Andy
Hi I watched that PSEN and RST pins with use of Oscilloscope. Both are fine, The Microcontroller IC is also changed. I also sent the circuit diagram what i used for this from mail ID "kssathis@gmail.com". Pls kindly suggess me, what I do to make a device to enter the ISP mode.
with thanks,
S.Sathishkumar
Did you check ALE and /EA?
Andy