topic Re: Can LPC1754 CRP settings be changed from code in runtime? in LPC Microcontrollers https://community.nxp.com/t5/LPC-Microcontrollers/Can-LPC1754-CRP-settings-be-changed-from-code-in-runtime/m-p/712818#M28796 <HTML><HEAD></HEAD><BODY><P>Hi Amit Gombi,</P><P>&nbsp;&nbsp; From the user manual, we can get that:</P><P>Code Read Protection is a mechanism that allows user to enable different levels of security in the system so that access to the on-chip flash and use of the ISP can be<BR />restricted. When needed, CRP is invoked by programming a specific pattern in flash location at <STRONG>0x000002FC</STRONG>.<STRONG> IAP commands are not affected by the code read protection.</STRONG></P><P><STRONG>&nbsp; </STRONG>So, when you run the code, you can use the IAP to modify the flash address 0X000002FC, to change the CRP, then do a software reset, the modified CRP will work.</P><P></P><P>Wish it helps you!</P><P></P><P></P><P></P><P><BR />Have a great day,<BR />Kerry</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Mon, 04 Sep 2017 03:27:27 GMT kerryzhou 2017-09-04T03:27:27Z Can LPC1754 CRP settings be changed from code in runtime? https://community.nxp.com/t5/LPC-Microcontrollers/Can-LPC1754-CRP-settings-be-changed-from-code-in-runtime/m-p/712816#M28794 <HTML><HEAD></HEAD><BODY><P>Customer needs to change CRP settings in runtime in code... Can it be done? If yes how?</P><P></P><P>Thanks,</P><P>amit.</P></BODY></HTML> Thu, 31 Aug 2017 17:37:53 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Can-LPC1754-CRP-settings-be-changed-from-code-in-runtime/m-p/712816#M28794 amit1234 2017-08-31T17:37:53Z Re: Can LPC1754 CRP settings be changed from code in runtime? https://community.nxp.com/t5/LPC-Microcontrollers/Can-LPC1754-CRP-settings-be-changed-from-code-in-runtime/m-p/712817#M28795 <HTML><HEAD></HEAD><BODY><P>I don't see why not. CRP is just a value in flash, so rewrite it (the whole sector containing the CRP value) and reset the cpu.&nbsp;</P></BODY></HTML> Thu, 31 Aug 2017 19:51:50 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Can-LPC1754-CRP-settings-be-changed-from-code-in-runtime/m-p/712817#M28795 converse 2017-08-31T19:51:50Z Re: Can LPC1754 CRP settings be changed from code in runtime? https://community.nxp.com/t5/LPC-Microcontrollers/Can-LPC1754-CRP-settings-be-changed-from-code-in-runtime/m-p/712818#M28796 <HTML><HEAD></HEAD><BODY><P>Hi Amit Gombi,</P><P>&nbsp;&nbsp; From the user manual, we can get that:</P><P>Code Read Protection is a mechanism that allows user to enable different levels of security in the system so that access to the on-chip flash and use of the ISP can be<BR />restricted. When needed, CRP is invoked by programming a specific pattern in flash location at <STRONG>0x000002FC</STRONG>.<STRONG> IAP commands are not affected by the code read protection.</STRONG></P><P><STRONG>&nbsp; </STRONG>So, when you run the code, you can use the IAP to modify the flash address 0X000002FC, to change the CRP, then do a software reset, the modified CRP will work.</P><P></P><P>Wish it helps you!</P><P></P><P></P><P></P><P><BR />Have a great day,<BR />Kerry</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Mon, 04 Sep 2017 03:27:27 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Can-LPC1754-CRP-settings-be-changed-from-code-in-runtime/m-p/712818#M28796 kerryzhou 2017-09-04T03:27:27Z