ST STM32F102 Series Reference Manual page 86

Reset and clock control (RCC)
Bit 23 USBRST USB reset
Set and reset by software.
0: No effect
1: Reset USB
Bit 22 I2C2RST I2C 2 reset
Set and reset by software.
0: No effect
1: Reset I2C 2
Bit 21 I2C1RST I2C 1 reset
Set and reset by software.
0: No effect
1: Reset I2C 1
Bit 20 UART5RST USART 5 reset
Set and reset by software.
0: No effect
1: Reset USART 5
Bit 19 UART4RST USART 4 reset
Set and reset by software.
0: No effect
1: Reset USART 4
Bit 18 USART3RST USART 3 reset
Set and reset by software.
0: No effect
1: Reset USART 3
Bit 17 USART2RST USART 2 reset
Set and reset by software.
0: No effect
1: Reset USART 2
Bits 16 Reserved, always read as 0.
Bit 15 SPI3RST SPI 3 reset
Set and reset by software.
0: No effect
1: Reset SPI 3
Bit 14 SPI2RST SPI 2 reset
Set and reset by software.
0: No effect
1: Reset SPI 2
Bits 13:12 Reserved, always read as 0.
Bit 11 WWDGRST Window Watchdog reset
Set and reset by software.
0: No effect
1: Reset window watchdog
Bits 10:6 Reserved, always read as 0.
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