When STM32F439 power supply is dropping from 3.3V to 0V what will be state of GPIO which is configured as Mode output pp, pull up and speed_fast whether it will hold to value mentioned in GPIOx_ODR

If we initialize the GPIO pin as Mode output pp, pull up and speed_fast using HAL_GPIO_Init()​ API then what will be the state of the GPIO pin when pin status is not set using HAL_GPIO_WritePin()

When HAL_Delay(420) is invoked for 420 milliseconds delay it is providing 438ms of delay when measured in CRO. void SysTick_Handler(void){  HAL_IncTick(); }