Dear Forum Members,

All factory fresh LPC9xx are meant to enter ISP mode when started for the first time since their status byte is set to 1. Till today I have used Keil MCB 900 type circuit with my LPC922 and it always worked with flashmagic. Today I tried to take the advantage of the factory set + NOTOUCH ISP entry and avoid using Keil MCB 900. The problem I face is when I use a fresh micro keil doesnt detect it. I tried to read status byte security bits etc. In all cases it shows attempting to connect and then says " Unable to conenct at specified baud ....... " I tried all possible bauds 2400, 4800, 7200, 9600, ...... but same response.

What works????

STEP 1. I opened hyperterminal connect to same com port. Baud 2400/4800/7200 8 None 1 No flow cntrl. Type 'u' it echoed some junk typed u again it echoes correctly 'u' then whatever is typed is echoes correctly.

STEP 2. Cloed hyperterminal stareted flashmagic same port same baud and tried reading device signature. It worked. I could do all ISP things including programming.

The above method worked at following baud rates. 2400, 4800 and 7200. If I turn off and then again try with flashmagic it says same cant connect. If I first use hyperterminal send 'u' twice and then open flashmagic it works. Have anybody faced this problem earlier is there something wrong with flashmagic or something else is wrong.

Thanks & Regards,
Prahlad Purohit