STMicroelectronics STM32F05 series Reference Manual page 166

Interrupts and events
Bits 31:20 Reserved, must be kept at reset value.
Bits 19:0 PRx: Pending bit on line x (x = 17 to 0)
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Bits 19 PR19: Pending bit on line 19
0: No trigger request occurred
1: selected trigger request occurred
This bit is set when the selected edge event arrives on the external interrupt line.
This bit is cleared by writing a 1 into the bit or by changing the sensitivity of the
edge detector.
Bits 18 Reserved, must be kept at reset value.
0: No trigger request occurred
1: selected trigger request occurred
This bit is set when the selected edge event arrives on the external interrupt line.
This bit is cleared by writing a 1 into the bit or by changing the sensitivity of the
edge detector.
Doc ID 018940 Rev 1
RM0091