1：引用STM8 的中断库

  #include "stm8s_exti.h"

2：配置外部中断的触发管脚

GPIO_Init(LEDS_PORT,MB,GPIO_MODE_IN_FL_IT );

或者

GPIO_Init(LEDS_PORT,MB,GPIO_MODE_IN_PU_IT );

3:初始化中断

EXTI_DeInit();

EXTI_SetTLISensitivity(EXTI_TLISENSITIVITY_RISE_ONLY);//下降沿触发中断
EXTI_SetExtIntSensitivity((EXTI_PORT_GPIOD),EXTI_SENSITIVITY_RISE_ONLY);

4：中断服务子程序的配置

（1）外部定义中断服务子程序

@far @interrupt void EXTI3 (void)

{
  disableInterrupts();
  counter ();
  enableInterrupts();
}

（2）声明外部中断子程序

extern void EXTI3 ();

（3）配置外部中断子程序向量表

struct interrupt_vector const _vectab[] = {
 {0x82, (interrupt_handler_t)_stext},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, EXTI3              },
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, TIM2_UPD_OVF_TRG_IRQHandler },
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, UART_RI            },
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
 {0x82, NonHandledInterrupt},
};

注：在配置中断实以上三部缺一不可