What's T1 and T2 for LPC9xx ISP hardware entry ?

Started by shiue, June 04, 2004, 10:48:12 PM

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shiue

Hi, everbody

What's T1 and T2 for LPC9xx ISP hardware entry ?
I look for nothing for T1 and T2.

Andy Ayre

Go to Options -> Advanced Options -> Hardware Config

T1 and T2 were added for the LPC9xx in Flash Magic version 1.96.

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shiue

Thanks Andy.

But, I mean that Why add t1 and t2 ?
What relation does the t1 & t2 have with the ISP?

Andy Ayre

Section 7.3.2 of the manual shows a simplified timing diagram. Looking at that you can see:

T1 = delay between powering down the device and powering the device back up
T2 = delay between powering up the device and applying the pulses

More capacitance on VDD = longer times needed for T1 and T2.

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