To make an IO port as an interrupt source for an external interrupt, three settings must be made. First, the direction of the IO port must be set to input; second, the trigger mode of the external interrupt must be selected, that is, whether it is a rising edge trigger or a falling edge trigger; third, the interrupt of the IO port must be enabled.
For example, if we want to set P1.0 as an external interrupt source, we can set it like this:
P1DIR&= ~BIT0; //Direction is set as input
P1IES |= BIT0; //trigger mode setting
P1IE |= BIT0; // Enable interrupt
In the trigger mode setting, 0 is rising edge trigger and 1 is falling edge trigger. After the setting is completed, you can use the external interrupt triggered by the falling edge or rising edge of the P1.0 port.
It should be noted that if interrupts are used in a design program, the general interrupt must be enabled before using the interrupt. The statement to enable the general interrupt in the IARfor430 environment is: _EINT(); Just like if we want to turn on the three lights A, B, and C, we need to turn on the main power switch in addition to turning on the switches of the three lights A, B, and C, otherwise the lights will not light up. The corresponding statement to turn off the general interrupt is: _DINT();
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