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How do you find the frequency of a clock?
Its reciprocal, fc = 1/Tc, is the clock frequency. All else being the same, increasing the clock frequency increases the work that a digital system can accomplish per unit time. Frequency is measured in units of Hertz (Hz), or cycles per second: 1 megahertz (MHz) = 106 Hz, and 1 gigahertz (GHz) = 109 Hz.
What is APB1 clock?
APB1 clock soruce is AHB prescaler but AHB clock input can be. HSI. HSE. PLL.
Why clock frequency is used?
In computing, the clock rate or clock speed typically refers to the frequency at which the clock generator of a processor can generate pulses, which are used to synchronize the operations of its components, and is used as an indicator of the processor’s speed.
What is maximum clock frequency?
Maximum Clock Frequency is a highest frequency at which the clock input of a IC can be drive, while maintaining proper operation. It is denoted by fmax.
What does CPU frequency do?
This is measured in gigahertz, which refers to billions of pulses per second and is abbreviated as GHz. A PC’s clock speed is an indicator of its performance and how rapidly a CPU can process data (move individual bits). A higher frequency (bigger number) suggests better performance in common tasks, such as gaming.
How to query apb1 clock frequency in STM32?
Generally, you just make the same choice STM32 did for the HAL function/macro you are using — require the system developer to pass in the clock rate he’s chosen.
How to determine clock frequency on a microcontroller?
On most microcontroller models it is possible to determine the clocks without knowing which crystal is in use, by measuring the ratio of two timers, one driven by main system clock, and another driven by slow reference clock (nearly all have a 32 kHz, either as an internal oscillator circuit or a secondary crystal).
How to read clock ratios from PLL configs?
The ratios can be read from PLL and/or clock divider configs. A few microcontrollers will allow only a single value for the external crystal when certain communication circuits are in use, such as Ethernet, high speed USB, or wireless radios.