ST STM32L0x3 User Manual

Reset and clock control (RCC) RM0367
220/1043 RM0367 Rev 7
Bit 26 PINRSTF: PIN reset flag
This bit is set by hardware when a reset from the NRST pin occurs.
It is cleared by writing to the RMVF bit, or by a POR.
0: No reset from NRST pin occurred
1: Reset from NRST pin occurred
Bit 25 OBLRSTF Options bytes loading reset flag
This bit is set by hardware when an OBL reset occurs.
It is cleared by writing to the RMVF bit, or by a POR.
0: No OBL reset occurred
1: OBL reset occurred
Bit 24 FWRSTF: Firewall reset flag
This bit is set by hardware when the firewall has generated a reset. It is cleared by writing to
the RMVF bit, or by a power-on reset.
0: No firewall reset occurred
1: firewall reset occurred
Bit 23 RMVF: Remove reset flag
This bit is set by software to clear the reset flags.
0: No effect
1: Clear the reset flags
Bits 22:20 Reserved, must be kept at reset value.
Bit 19 RTCRST: RTC software reset bit
This bit is set and cleared by software.
0: Reset not activated
1: Resets the RTC peripheral, its clock source selection and the backup registers.
Bit 18 RTCEN: RTC clock enable bit
This bit is set and cleared by software.
It is reset by setting the RTCRST bit or by a POR.
0: RTC clock disabled
1: RTC clock enabled
Bits 17:16 RTCSEL[1:0]: RTC and LCD clock source selection bits
These bits are set by software to select the clock source for the RTC.
Once the RTC and LCD clock source has been selected it cannot be switched until RTCRST
is set or a Power On Reset occurred. The only exception is if the LSE oscillator clock was
selected, if the LSE clock stops and it is detected by the CSSLSE, in that case the clock can
be switched.
00: No clock
01: LSE oscillator clock used as RTC/LCD clock
10: LSI oscillator clock used as RTC/LCD clock
11: HSE oscillator clock divided by a programmable prescaler (selection through the
RTCPRE[1:0] bits in the RCC clock control register (RCC_CR)) used as the RTC/LCD clock
If the LSE or LSI is used as RTC clock source, the RTC continues to work in Stop and
Standby low-power modes, and can be used as wake-up source. However, when the HSE
clock is used as RTC clock source, the RTC cannot be used in Stop and Standby low-power
modes.
Bit 15 Reserved, must be kept at reset value.

ST STM32L0x3 Specifications

General

Brand	ST
Model	STM32L0x3
Category	Microcontrollers
Language	English