What is the difference between external ROM and built-in ROM programs?

lzz791118

The same program can be run when the external ROM is installed, and it can't be moved when it is changed to run in the internal ROM mode.
I removed os, and only used the main function and the interrupt function, and it worked, but os died.
What are the possible errors? Thank you

273237407

There are many issues involved, such as the interruption of the OS and the interruption of your application, because if you are based on the OS, the OS will take over all interrupts, you need to register the interrupt request with the OS, and if there is no OS, you need to do it yourself Handling interrupts, the operations of the two are different. According to my understanding, the external rom and the internal rom should have no effect. If you need any help, you can describe the problem clearly, and you may be able to help.

lzz791118

Thank you friends upstairs
But there is no problem with this program running on an external rom. I think it should not be a bug in the program itself.
If there is an error, it can’t run on the external rom.
Still looking for the problem. . .
Thanks a lot

lzz791118

Thank you, the problem is solved, the control register of the data line port in the internal and external rom mode has a problem, thank you for your answer