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This article mainly explains the "arm9 clock and timer how to achieve", the article explains the content is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "arm9 clock and timer how to achieve" it!

First, take a look at the relationship between each module and the clock bus:

When the chip is first powered on, the running clock is equal to the crystal clock Fin. The running frequency can be increased by setting MPLL and UPLL.

MPLL calculation method:

Example: Fout = (2 * (MDIV + 8) * Fin) / (PDIV + 2) * (2 ^ SDIV))

Fout = 200MHz = (2 * (92 + 8) * 12) / (1 + 2) * (2 ^ 2)

MDIV = 92

PDIV = 1

SDIV = 2

# define S3C2440_MPLL_200MHZ ((0x5c

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