ST STM32L0x3 User Manual

RM0367 Rev 7 1009/1043
RM0367 Code examples
1020
/* (3) Set prescaler by 8 */
/* (4) Set reload value to have a rollover each 100ms */
/* (5) Check if flags are reset */
/* (6) Set a 50ms window, this will refresh the IWDG */
IWDG->KR = IWDG_START; /* (1) */
IWDG->KR = IWDG_WRITE_ACCESS; /* (2) */
IWDG->PR = IWDG_PR_PR_0; /* (3) */
IWDG->RLR = IWDG_RELOAD; /* (4) */
while(IWDG->SR) /* (5) */
{
/* add time out here for a robust application */
}
IWDG->WINR = IWDG_RELOAD >> 1; /* (6) */
A.14 WWDG code example
A.14.1 WWDG configuration code example
/* (1) set prescaler to have a rollover each about 16.5ms, set window
value (about 7.5ms) */
/* (2) Refresh WWDG before activate it */
/* (3) Activate WWDG */
WWDG->CFR = 0x0060; /* (1) */
WWDG->CR = WWDG_REFRESH; /* (2) */
WWDG->CR |= WWDG_CR_WDGA; /* (3) */
A.15 RTC code example
A.15.1 RTC calendar configuration code example
/* (1) Write access for RTC registers */
/* (2) Enable init phase */
/* (3) Wait until it is allow to modify RTC register values */
/* (4) set prescaler, 40kHz/64 => 625Hz, 625Hz/625 => 1Hz */
/* (5) New time in TR */
/* (6) Disable init phase */
/* (7) Disable write access for RTC registers */
RTC->WPR = 0xCA; /* (1) */
RTC->WPR = 0x53; /* (1) */
RTC->ISR = RTC_ISR_INIT; /* (2) */
while((RTC->ISR & RTC_ISR_INITF)!=RTC_ISR_INITF) /* (3) */
{
/* add time out here for a robust application */
}
RTC->PRER = 0x003F0270; /* (4) */

ST STM32L0x3 Specifications

General

Brand	ST
Model	STM32L0x3
Category	Microcontrollers
Language	English