ST STM32G474 User Manual

Reset and clock control (RCC) RM0440
330/2126 RM0440 Rev 4
Bits 31:26 Reserved, must be kept at reset value.
Bit 25 LSCOSEL: Low speed clock output selection
Set and cleared by software.
0: LSI clock selected
1: LSE clock selected
Bit 24 LSCOEN: Low speed clock output enable
Set and cleared by software.
0: Low speed clock output (LSCO) disable
1: Low speed clock output (LSCO) enable
Bits 23:17 Reserved, must be kept at reset value.
Bit 16 BDRST: RTC domain software reset
Set and cleared by software.
0: Reset not activated
1: Reset the entire RTC domain
Bit 15 RTCEN: RTC clock enable
Set and cleared by software.
0: RTC clock disabled
1: RTC clock enabled
Bits 14:10 Reserved, must be kept at reset value.
Bits 9:8 RTCSEL[1:0]: RTC clock source selection
Set by software to select the clock source for the RTC. Once the RTC clock source has been
selected, it cannot be changed anymore unless the RTC domain is reset, or unless a failure
is detected on LSE (LSECSSD is set). The BDRST bit can be used to reset them.
00: No clock
01: LSE oscillator clock used as RTC clock
10: LSI oscillator clock used as RTC clock
11: HSE oscillator clock divided by 32 used as RTC clock
Bit 7 Reserved, must be kept at reset value.
Bit 6 LSECSSD: CSS on LSE failure Detection
Set by hardware to indicate when a failure has been detected by the Clock Security System
on the external 32 kHz oscillator (LSE).
0: No failure detected on LSE (32 kHz oscillator)
1: Failure detected on LSE (32 kHz oscillator)
Bit 5 LSECSSON: CSS on LSE enable
Set by software to enable the Clock Security System on LSE (32 kHz oscillator).
LSECSSON must be enabled after the LSE oscillator is enabled (LSEON bit enabled) and
ready (LSERDY flag set by hardware), and after the RTCSEL bit is selected.
Once enabled this bit cannot be disabled, except after a LSE failure detection (LSECSSD
=1). In that case the software MUST disable the LSECSSON bit.
0: CSS on LSE (32 kHz external oscillator) OFF
1: CSS on LSE (32 kHz external oscillator) ON

ST STM32G474 Specifications

General

Brand	ST
Model	STM32G474
Category	Microcontrollers
Language	English