Hi, I am using a STM32F042K6 MCU, I tried to initialize CAN_MCR from reset mode(0x00010002) to initialization mode(0x00010001). But I found I was not able to change its value by using the code: What could be the reason? Thanks, John

[Tesla DeLorean]

Let's not put the entire question in the title/summary.

Post code that illustrates what you're doing. Ideally replicate the issue with library code, and contrast that with register code.