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What is RCC_APB2Periph_AFIO clock signal?

Question asked by holojda.slawomir on Mar 20, 2012
Latest reply on Mar 20, 2012 by Andrew Neil
Hi. Could You help me to understand somethink. In STM32 like STM32F103c8... there is a clock signal called RCC_APB2Periph_AFIO. When should be turned on this signal, always when I use peripherial, like Timmer, AD, USART or I2C or maybe when I used pins attached to this peripherial?
Why we turn on this clock and also we give clock to the peripherial like ADC, SPI, USART? Why not only to ADC, SPI, USART but also to AFIO?