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UM1940

LL UTILS Generic Driver

DocID028236 Rev 2

1295/1371

Parameters

UTILS_PLLInitStruct: pointer to a

LL_UTILS_PLLInitTypeDef structure that contains the

configuration information for the PLL.

UTILS_ClkInitStruct: pointer to a LL_UTILS_ClkInitTypeDef

structure that contains the configuration information for the

BUS prescalers.

Return values

An: ErrorStatus enumeration value:

SUCCESS: Max frequency configuration done

ERROR: Max frequency configuration not done

Notes

The application need to ensure that PLL is disabled.

Function is based on the following formula: PLL output

frequency = (((HSI frequency / PLLM) * PLLN) / PLLP)PLLM:

ensure that the VCO input frequency ranges from 0.95 to 2.10

MHz (PLLVCO_input = HSI frequency / PLLM)PLLN: ensure

that the VCO output frequency is between 192 and 432 MHz

(PLLVCO_output = PLLVCO_input * PLLN)PLLP: ensure that

max frequency at 120000000 Hz is reached (PLLVCO_output

/ PLLP)

LL_PLL_ConfigSystemClock_HSE

Function name

ErrorStatus LL_PLL_ConfigSystemClock_HSE (uint32_t

HSEFrequency, uint32_t HSEBypass,

LL_UTILS_PLLInitTypeDef * UTILS_PLLInitStruct,

LL_UTILS_ClkInitTypeDef * UTILS_ClkInitStruct)

Function description

This function configures system clock with HSE as clock source of

the PLL.

Parameters

HSEFrequency: Value between Min_Data = 4000000 and

Max_Data = 26000000

HSEBypass: This parameter can be one of the following

values:

LL_UTILS_HSEBYPASS_ON

LL_UTILS_HSEBYPASS_OFF