ST STM32F405 Reference Manual page 299

RM0090
Bits 31:16 Reserved, must be kept at reset value.
Bits 15:0 EXTIx[3:0]: EXTI x configuration (x = 8 to 11)
9.3.6 SYSCFG external interrupt configuration register 4
(SYSCFG_EXTICR4)
Address offset: 0x14
Reset value: 0x0000 0000
31 30 29
15 14 13
EXTI15[3:0]
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Bits 31:16 Reserved, must be kept at reset value.
Bits 15:0 EXTIx[3:0]: EXTI x configuration (x = 12 to 15)
These bits are written by software to select the source input for the EXTIx
external interrupt.
0000: PA[x] pin
0001: PB[x] pin
0010: PC[x] pin
0011: PD[x] pin
0100: PE[x] pin
0101: PF[x] pin
0110: PG[x] pin
0111: PH[x] pin
1000: PI[x] pin
1001: PJ[x] pin
Note: PK[11:8] are not used.
28 27 26 25
12 11 10 9
EXTI14[3:0]
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These bits are written by software to select the source input for the EXTIx external
interrupt.
0000: PA[x] pin
0001: PB[x] pin
0010: PC[x] pin
0011: PD[x] pin
0100: PE[x] pin
0101: PF[x] pin
0110: PG[x] pin
0111: PH[x] pin
1000: PI[x] pin
1001: PJ[x] pin
Note: PK[15:12] are not used.
System configuration controller (SYSCFG)
24 23 22
Reserved
8 7 6
EXTI13[3:0]
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RM0090 Rev 18
21 20 19 18
5 4 3 2
EXTI12[3:0]
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17 16
1 0
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