This article mainly analyzes SPI1 because SPI1 is somewhat special on the clock line APB2.
1. To analyze the SPI communication rate, we must first check the STM32F103 datasheet and the commonly used working conditions, as shown in the figure below.
2. From the datasheet, we can know that the communication rate of SPI1 can reach 18MHz, as shown in the figure below.
From the datasheet, we know that the communication rate of SPI1 can reach 18Mb/s. If SPI is configured with 8-bit data width, the frequency is 18MHz. This rate is only measured under common working conditions. It does not mean that SPI1 can only reach 18MHz at most. fPCLK2 is 72MHz, and SPI1 must be divided by at least two, so the maximum clock frequency of SPI1 is 36MHz. This frequency is already overclocked under common conditions. 18MHz is only the rate under the most stable conditions measured by the official, so the clock frequency of SPI is not limited to 18MHz. In view of the fact that the maximum frequency of SPI can only be 36MHz as stated on the Internet, I do not agree. Even if fPCLK2 is 72MHz and the SPI1 clock is divided by 2, it will not be limited to 18MHz, but still 36MHz.
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