Content originally posted in LPCWare by riccardoventrella on Tue Mar 17 08:37:10 MST 2015
Thanks for the pdf,
I finally found it before your answer, nevertheless you answer was really helpful in addressing me
to the proper chapters.
Since I've found so many CRP experts thank to this post, I'd like to post you some related question, if possible.
1) my aim is to avoid other people cloning flash code. As far as I can have understood, to achieve this it should
be enough to use CRP, i.e. using "simply" 4337 instead of 43S37.
Since I don't need to use AES, I think CRP should by far enough, isn't it?
2) reading from page 68 of the UM10503.pdf, I had some problem in understanding fully the CRP3 level description:
"This mode effectively disables ISP override using the P2_7 pin. It is up to the user’s
application to provide for flash updates by using IAP calls or by invoking ISP. Caution:
If CRP3 is selected, no future fact ory testing can be performed on the device"
So, does this mean the flash is no more readable at all, neither the JTAG would be, but we can STILL
flash firmware updates through ISP or IAP?
Thanks