STM8 has a maximum of 32 interrupt systems. In addition, there is a special interrupt in the external interrupt called TLI non-maskable interrupt, that is, PD7. It does not belong to the D interrupt vector but has its own TLI interrupt vector.
A, B, C, D, E, only one of these ports can be used as an interrupt input at the same time, for example, PA0, PB0, PC0, PE0, etc., only one can be used as an interrupt input at the same time.
Procedure for using external interrupts
1. Configure interrupt vector
2. Configure the trigger mode of the interrupt port
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