Author Topic: Skip ISP check at power on?  (Read 4524 times)

Geeliwan

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Skip ISP check at power on?
« on: March 28, 2008, 01:44:35 am »
Hi!

The datasheet says that there will be a 400ms (depending on the oscillator) delay at power on where the ISP-code waits for a possible connection.
Well, 400ms is hell too long for my application. Is there a way to skip that auto-baud-thing and start the user programm right away?
That delay seems to be no problem for the other forum-members, or they found a way to avoid it ;-)
I searched the datasheet and other documents from NXP but to no avail.

Thanks for your help!
Markus

Je Gold

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Re: Skip ISP check at power on?
« Reply #1 on: March 28, 2008, 04:54:46 am »
See here
http://www.8052.com/forum/thread.phtml?thread=139797

Hence replacing the bootloader with Ver 7  you can use a port pin to select bootloader instead of  UART 'U' command.


==> Be aware you can get in to problems replacing bootloaders etc.

Joe



Geeliwan

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Re: Skip ISP check at power on?
« Reply #2 on: April 05, 2008, 02:11:51 pm »
Hi Joe!

Thank you for telling me about that bootloader. I will give it a try.
Oh, by the way: the link is broken but I found the bootloader anyway.

Thanks again and have a good time!
Markus