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P89V51Rx2/P89LV51Rx2 / Re: How do I change a chip from 6-clock mode back to 12-clock mode?
October 03, 2011, 11:19:01 AM
Quote from: Andy Ayre on September 29, 2011, 09:13:18 PM
You will have to check the user manual for the device from NXP. I don't have it to hand but for some devices it requires a parallel programmer and for others it is a one-way fuse and cannot be reversed.

Andy

I checked the datasheet, but I haven't been able to find any mention that you can't clear the double clock mode bit using ISP. 
#2
P89V51Rx2/P89LV51Rx2 / How do I change a chip from 6-clock mode back to 12-clock mode?
September 29, 2011, 10:59:40 AM
I've got some boards that have P89LV51RD2 chips that somehow got the 6-clock (double clock) bit set.  How do I clear that?  Tried resetting, erasing all flash, etc.  There's an ISP command to set 6-clock mode, but no command to clear it.
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