DocID024597 Rev 3 249/1693
RM0351 Reset and clock control (RCC)
253
Bit 25 OBLRSTF: Option byte loader reset flag
Set by hardware when a reset from the Option Byte loading occurs.
Cleared by writing to the RMVF bit.
0: No reset from Option Byte loading occurred
1: Reset from Option Byte loading occurred
Bit 24 FWRSTF: Firewall reset flag
Set by hardware when a reset from the firewall occurs.
Cleared by writing to the RMVF bit.
0: No reset from the firewall occurred
1: Reset from the firewall occurred
Bit 23 RMVF: Remove reset flag
Set by software to clear the reset flags.
0: No effect
1: Clear the reset flags
Bits 22:12 Reserved, must be kept at reset value.
Bits 11:8 MSISRANGE[3:1] MSI range after Standby mode
Set by software to chose the MSI frequency at startup. This range is used after exiting
Standby mode until MSIRGSEL is set. After a pad or a power-on reset, the range is always
4 MHz. MSISRANGE can be written only when MSIRGSEL = ‘1’.
0100: Range 4 around 1 MHz
0101: Range 5 around 2 MHz
0101: Range 6 around 4 MHz (reset value)
0111: Range 7 around 8 MHz
others: reserved
Note: Changing the MSISRANGE does not change the current MSI frequency.
Bits 7:2 Reserved, must be kept at reset value.
Bit 1 LSIRDY: LSI oscillator ready
Set and cleared by hardware to indicate when the LSI oscillator is stable. After the LSION bit
is cleared, LSIRDY goes low after 3 LSI oscillator clock cycles. This bit can be set even if
LSION = 0 if the LSI is requested by the Clock Security System on LSE, by the Independent
Watchdog or by the RTC.
0: LSI oscillator not ready
1: LSI oscillator ready
Bit 0 LSION: LSI oscillator enable
Set and cleared by software.
0: LSI oscillator OFF
1: LSI oscillator ON
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