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

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]

 

製品: マイクロコントローラ ,8ビット 8051 MCU ,Arm Cortex-M0 MCU ,Arm Cortex-M4 MCU
アプリケーション:
機能: Peripherals,ARM,Interrupt,I/O,External Interrupt,GPIO
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