while((* (reg8 *) CYREG_RESET_SR0) != 0);

// 6.) set the voltage monitor trip thresholds

// under "voltage monitors". 0x66 is 3.2 v, 0x55 is 2.95v

// RESET_CR0 (high nibble is LVI-A threshold, low nibble is LVI-D threshold)

(* (reg8 *) CYREG_RESET_CR0) = 0x55;

// 7.) select the Fixed Function Path for interrupt vector 0 (LVD-A/D interrupt)

(* (reg8 *) CYREG_IDMUX_IRQ_CTL0) &= ~0x03;

// 8.) register the previously defined ISR address in the interrupt vector table for vector 0

// blarf is a made up name to show how the process works

CY_SET_REG16(CYDEV_INTC_VECT_MBASE + 2*0, blarf);

// 9.) we can change the default priority setting if we desire.

(* (reg8 *) CYREG_INTC_PRIOR0) = 0x07 << 5;

// 10.) enable the interrupt (vector 0)

(* (reg8 *) CYREG_INTC_SET_EN0) |= 0x01;

// 11.) enable global interrupts

CYGlobalIntEnable;

while(1)

{

// Test is a pin connected to an LED

Test_Write(0);

}

}

经测试，该程序工作正常，当电源电压下降到指定阀值后将产生中断并运行中断服务子程序，即LED灯点亮。

作者： 田江学 主任应用工程师 赛普锐思半导体（上海）有限公司