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Update README.md
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@ -216,9 +216,9 @@ Please set the macro `EVENT_TIMESTAMP_SOURCE` to `3` to suppress it.
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#### 1.5.1 System Frequency Changing
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#### 1.5.1 System Frequency Changing
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If you want to change the System Frequency, **after** the changing, make sure:
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If you want to change the System Frequency, **after** the change, make sure:
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1. The `SystemCoreClock` has been updated with the new system frequency. Usually the HAL will update the `SystemCoreClock` automatically, but in some rare case where `SystemCoreClock` is updated accordingly, you should do it yourself.
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1. The `SystemCoreClock` has been updated with the new system frequency. Usually, the HAL will update the `SystemCoreClock` automatically, but in some rare cases where `SystemCoreClock` is updated accordingly, you should do it yourself.
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2. please call `update_perf_counter()` to notify perf_counter.
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2. please call `update_perf_counter()` to notify perf_counter.
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