ST STM32L4 5 Series Reference Manual page 242

Reset and clock control (RCC)
Bit 21 I2C1RST: I2C1 reset
Bit 20 UART5RST: UART5 reset
Bit 19 UART4RST: UART4 reset
Bit 18 USART3RST: USART3 reset
Bit 17 USART2RST: USART2 reset
Bit 16 Reserved, must be kept at reset value.
Bit 15 SPI3RST: SPI3 reset
Bit 14 SPI2RST: SPI2 reset
Bits 13:10 Reserved, must be kept at reset value.
Bit 9 LCDRST: LCD interface reset
Bits 8:6 Reserved, must be kept at reset value.
Bit 5 TIM7RST: TIM7 timer reset
Bit 4 TIM6RST: TIM6 timer reset
242/1830
Set and cleared by software.
0: No effect
1: Reset I2C1
Set and cleared by software.
0: No effect
1: Reset UART5
Set and cleared by software.
0: No effect
1: Reset UART4
Set and cleared by software.
0: No effect
1: Reset USART3
Set and cleared by software.
0: No effect
1: Reset USART2
Set and cleared by software.
0: No effect
1: Reset SPI3
Set and cleared by software.
0: No effect
1: Reset SPI2
Set and cleared by software.
0: No effect
1: Reset LCD
Set and cleared by software.
0: No effect
1: Reset TIM7
Set and cleared by software.
0: No effect
1: Reset TIM6
DocID024597 Rev 5
RM0351