These are two different concepts, Keil is software and KeilC is language. Keil is the MCU development, compilation, debugging environment, KeilC is the language used to develop the MCU, that is, the application of C language in the MCU. Now there are many versions of the Keil development environment, and there are different hardware versions, such as Keil
对于
C51,Keil
对于
手臂。