start up code

[niuniu]

Hello, I am using MPC5644. I'd like to ask that for a unique MCU(e.g. MPC5644) is there any guide or instruction from the manufacture that describing how we should designed the start up code? Such as the initialization sequence and how to use the assembly instructions? Currently I looked for reference mostly on the MCU user manual and the core manual. Where can I find the guide to help to make a start up code and then a bootloader? Thank you very much!

[niuniu]

Hello, Lukas,

Thank you for your kindly support. I will try to solve my problem from your kindly answer. Have a nice day!

[lukaszadrapa]

Hi,

You can take a look at this application note:

https://www.nxp.com/docs/en/application-note/AN4097.pdf

It’s written for MPC5674F but a lot of things are the same for MPC5644A.

Generally speaking, it is necessary to set RCHW and reset vector, initialize SRAM memory and then initialize C environment (set stack pointer, data pointers, copy initialization data). Optionally, you can configure other features like PLL, cache and so on but this can be done also in C code in main function.

Or, the easiest way is to use default startup files which are generated by CodeWarrior when creating new project.

Then see this draft of application note – it describes how to write bootloader and user application for MPC56xx devices:

https://community.nxp.com/servlet/JiveServlet/download/427962-1-279359/bootloader.zip

It is written for MPC5634M which is very similar to MPC5644A.

And this is application note for MPC57xx (MPC5748G and UART) – it’s almost the same, just modified for MPC57xx:

http://www.nxp.com/assets/documents/data/en/application-notes/AN5319.pdf

http://www.nxp.com/assets/documents/data/en/application-notes-software/AN5319SW.zip

Regards,

Lukas