Each GPIO of STM32 can be configured as an external interrupt trigger source, which is also the strength of STM32. STM32 divides many interrupt trigger sources into different groups according to the pin numbers. For example, PA0, PB0, PC0, PD0, PE0, PF0, PG0 are the first group, and so on. We can conclude that there are 16 groups in total. STM32 stipulates that only one interrupt trigger source can work at the same time in each group, so the maximum number of working external interrupts is 16. The interrupt controller of STM32F103 supports 19 external interrupt/event requests. Each interrupt has a status bit, and each interrupt/event has independent trigger and mask settings. The 19 external interrupts of STM32F103 are:
Lines 0~15: correspond to the input interrupt of the external IO port.
Line 16: Connects to PVD output.
Line 17: Connects to the RTC alarm event.
Line 18: Connected to USB wakeup event.
| GPIO Pins | Interrupt flag | Interrupt handling function |
| PA0~PG0 | EXTI0 | EXTI0_IRQHandler |
| PA1~PG1 | EXTI1 | EXTI1_IRQHandler |
| PA2~PG2 | EXTI2 | EXTI2_IRQHandler |
| PA3~PG3 | EXTI3 | EXTI3_IRQHandler |
| PA4~PG4 | EXTI4 | EXTI4_IRQHandler |
| PA5~PG5 | EXTI5 | EXTI9_5_IRQHandler |
| PA6~PG6 | EXTI6 | |
| PA7~PG7 | EXTI7 | |
| PA8~PG8 | EXTI8 | |
| PA9~PG9 | EXTI9 | |
| PA10~PG10 | EXTI10 | EXTI15_10_IRQHandler |
| PA11~PG11 | EXTI11 | |
| PA12~PG12 | EXTI12 | |
| PA13~PG13 | EXTI13 | |
| PA14~PG14 | EXTI14 | |
| PA15~PG15 | EXTI15 |
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