MDK的C51组件在哪儿下载
Please post your question in the English language, thank you.
The download of PK51 is offered at:
https://developer.arm.com/Tools%20and%20Software/Keil%20PK51
Related:
https://developer.arm.com/documentation/102516/1-3/User-based-licensing-overview/Backwards-compatibility
https://www.arm.com/products/development-tools/distributors