51 microcontroller-STC89C52 series learning Part 3: Interrupt learning-EEWORLD

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Eight interrupt request sources:

1. External interrupt 0

2. External interrupt 1

3. External interrupt 2

4. External interrupt 3

5. Timer 0 interrupt

6. Timer 1 interrupt

7. Timer 2 interrupt

8. Serial port interruption

All interrupts have four interrupt priority levels:

Priority 0: 0,0 (lowest)

Priority 1: 0,1

Priority 2: 1,0

Priority 3: 1,1 (highest)

Interrupt triggering method:

External interrupts 0, 1, 2, and 3 can be triggered by either low level or falling edge.

Timer interrupt 0, 1: overflow

Serial port interrupt: sending or receiving completed

C language programming, the interrupt query sequence number is the interrupt number:

void Int0_ISR(void) interrupt 0;

void timer0_ISR(void) interrupt 1;

void Int1_ISR(void) interrupt 2;

void timer1_ISR(void) interrupt 3;

void uart_ISR(void) interrupt 4;

void timer2_ISR(void) interrupt 5;

void Int2_ISR(void) interrupt 6;

void Int3_ISR(void) interrupt 7;

Interrupt register:

Reference address：51 microcontroller-STC89C52 series learning Part 3: Interrupt learning

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