Non functional ERASE

Discussion around product based on ARM Cortex M3 core.

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soda
Location: Prague
Posts: 1
Joined: Wed Nov 21, 2007 6:31 pm

Non functional ERASE

Mon Dec 15, 2014 11:37 am

Hi folks,
with sam3s2b in certain cases, when you load the program which will very soon becomes waiting for slow clock to stabilize - and there is no crystal on the board - it becomes stuck: neither flash load works anymore, nor Erase signal applied properly works! This was reproduced on several sam3s2b boards, on which slow clocks are provided by on-board peripheral which hasn't be configured properly to generate slow clocks.

Solution:
if you run in such troubles as I did, the solution is to conenct external 32kHz signal to the XIN32 pin (I made one from 74hc14, crystal and few resistors). This will make Erase to work again and/or flash load to works.

Not sure if this problem is only on sam3. Please put a feedback here with your experiences.

Regards

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