topic MK12DN512VLH5 with no FlexMemory - how big are the logical program FLASH blocks (to erase/program them during runtime while the code is always running from this FLASH too)? in Kinetis Microcontrollers

MK12DN512VLH5 with no FlexMemory - how big are the logical program FLASH blocks (to erase/program them during runtime while the code is always running from this FLASH too)?

hexman — Thu, 12 Jun 2014 21:06:18 GMT

Hi, I plan to use an MK12DN512VLH5 with 512KB of program FLASH and no FlexMemory. My question is, whether I can use say 16KB of it for firmware (instructions and data always executed from the 16KB portion of the FLASH) and the rest for data logging. K12 Sub-family Reference Manual says:"Read access to one logical program FLASH block is possible while programming or erasing data in the other logical program FLASH block." How big is the logical program FLASH block in the MK12DN512VLH5 in this situation/context? Thank you!

Re: MK12DN512VLH5 with no FlexMemory - how big are the logical program FLASH blocks (to erase/program them during runtime while the code is always running from this FLASH too)?

Jorge_Gonzalez — Thu, 12 Jun 2014 21:33:57 GMT

Hello hexman:

Your device has 2 P-Flash blocks, each one of 256 KB. The addresses are described in the Reference Manual K12P64M50SF4RM:

So you can execute code or read variables from one of these blocks while writing or erasing the other.

Hope this helps.

Regards!,
Jorge Gonzalez

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Re: MK12DN512VLH5 with no FlexMemory - how big are the logical program FLASH blocks (to erase/program them during runtime while the code is always running from this FLASH too)?

hexman — Thu, 12 Jun 2014 21:49:43 GMT

Hi Jorge, thank you for the quick reply! It seems I will have to have a copy of code and interrupt vectors in both FLASH blocks to be able to use the rest of FLASH for logging... Nice. The easier variant would be to use the lower 256KB just for the code, and the upper one for logging.