ST STM32F103 series

DocID13902 Rev 15 108/1128
RM0008 Low-, medium-, high- and XL-density reset and clock control (RCC)
122
Bit 4 IOPCRST: IO port C reset
Set and cleared by software.
0: No effect
1: Reset IO port C
Bit 3 IOPBRST: IO port B reset
Set and cleared by software.
0: No effect
1: Reset IO port B
Bit 2 IOPARST: IO port A reset
Set and cleared by software.
0: No effect
1: Reset IO port A
Bit 1 Reserved, must be kept at reset value.
Bit 0 AFIORST: Alternate function IO reset
Set and cleared by software.
0: No effect
1: Reset Alternate Function