RM0366 Datasheet, PDF (143/868 Pages) STMicroelectronics – This reference manual targets application developers

General-purpose I/Os (GPIO)
Bits 31:16 Reserved
Bits 15:0 BRy: Port x Reset bit y (y= 0..15)
These bits are write-only. A read to these bits returns the value 0x0000
0: No action on the corresponding ODRx bit
1: Reset the corresponding ODRx bit
RM0366
143/868
DocID025203 Rev 2