Renesas Single-Chip Microcomputer M38C89T-ADF Manual do Utilizador descarregar pdf (Página 119)

5-3

4BUsage Examples

5.1 21BInterrupt control

);

if ((irq_status & 0x01) == 0)

{

/* Disable IRQ1 */

R_INTC_ControlExtInterrupt(

PDL_INTC_IRQ1,

PDL_INTC_CLEAR_IR_FLAG

);

}

/* Has IRQ2 triggered? */

if (irq2_low == 1)

{

/* Re-enable the interrupt if the signal has returned to the high level */

R_IO_PORT_Compare(

PDL_IO_PORT_E_2,

ReEnableIRQ2

);

}

void IRQ0Handler(void)

{

/* Process the IRQ0 event here (the flag is cleared automatically */

switch_sw1_pressed = 1;

}

void IRQ2Handler(void)

{

/* Disable the level-triggered interrupt */

R_INTC_ControlExtInterrupt(

PDL_INTC_IRQ2,

PDL_INTC_CLEAR_IR_FLAG

);

irq2_low = 1;

}

static void ReEnableIRQ2 (void)

{

/* Re-enable the interrupt (and try to clear it) */

R_INTC_ControlExtInterrupt(

PDL_INTC_IRQ2,

PDL_INTC_ENABLE | PDL_INTC_CLEAR_IR_FLAG

);

}

Figure 5-1 Example of External Interrupt

1 2 ... 114 115 116 117 118 119 120 121 122 123 124 ... 137 138

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