Author Topic: Reset Generator Compatibility  (Read 3118 times)

laserplumb

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Reset Generator Compatibility
« on: March 10, 2010, 04:10:32 pm »
What is the maximum reset delay Flash Magic will work with?  
I'm designing a few circuit boards with LPC-2388. I would like to add support for Flash Magic, with RS-232 DSR enabling reset . My design has a MAX811 reset generator driving processor reset.
I see an earlier post "Adding delay before sending '?'" where a MAX811 delay of 285ms was discussed. In that discussion, Flash Magic v4.62 was shown to work. But no mention of the maximum reset delay (after DSR is done) that it will tolerate.
My MAX811 spec specifies 560ms max reset pulse width. Knowing the actual max reset delay Flash Magic can tolerate would be helpful.
For comparison, the Keil board I have shows an RC reset w/ 100nF and 47Kohm = 4.7ms time constant.
Thanks, Laser Plumb Bob
« Last Edit: March 10, 2010, 04:15:28 pm by laserplumb »

Andy Ayre

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Re: Reset Generator Compatibility
« Reply #1 on: March 19, 2010, 02:38:10 pm »
The reset signal (DTR) is asserted by Flash Magic for the configurable time T2. After deasserting the reset signal there is a hard-coded delay of 350ms.

T2 is configured by going to Options -> Advanced Options -> Hardware Config

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