It takes different time for the GPIO interrupt and external interrupt to find trigger sources. Therefore, external interrupts are used in special urgent events, and a set of GPIO interrupt is shared in common events.

In the M051, for example, the 16 pins of P0 [7: 0] and P1 [7: 0] share the GP01_INT interrupt handler. Polling is needed to find the trigger source when an interrupt occurs, which takes more time. EINT0 is only triggered by P3.2 and thus does not require polling, which relatively saves time.

Table 1 M051Interrupt Mapping Table

Interrupt Name	Interrupt Description
EINT0	External signal interrupt from P3.2 pin
GP01_INT	External signal interrupt from P0[7:0] / P1[7:0]

Products:	Microcontrollers ,8bit 8051 MCUs ,Arm Cortex-M0 MCUs ,Arm Cortex-M4 MCUs
Applications:
Function:	Peripherals,ARM,Interrupt,I/O,External Interrupt,GPIO

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When to use GPIO interrupt and external interrupt? Issue Date：2018-01-16

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