Microchip Technology dsPIC33F Family Manual de usuario descargar pdf (Pagina 11)

Section 11. Timers

Timers

Example 11-1: Initialization Code for 16-Bit Timer Mode

Figure 11-4: Interrupt Timing for Timer Period Match

Note: The timer counts PRx times for the first TxIF event and (PRx + 1) times for all

subsequent TxIF events. For applications in which the asymmetry in interrupt timing

is not acceptable, it is recommended to ignore the first TxIF event after enabling the

timer.

T1CONbits.TON = 0; // Disable Timer

T1CONbits.TCS = 0; // Select internal instruction cycle clock

T1CONbits.TGATE = 0; // Disable Gated Timer mode

T1CONbits.TCKPS = 0b00; // Select 1:1 Prescaler

TMR1 = 0x00; // Clear timer register

PR1 = 9; // Load the period value

IPC0bits.T1IP = 0x01; // Set Timer1 Interrupt Priority Level

IFS0bits.T1IF = 0; // Clear Timer1 Interrupt Flag

IEC0bits.T1IE = 1; // Enable Timer1 interrupt

T1CONbits.TON = 1; // Start Timer

/* Example code for Timer1 ISR */

void __attribute__((__interrupt__, no_auto_psv)) _T1Interrupt(void)

{

/* Interrupt Service Routine code goes here */

IFS0bits.T1IF = 0; // Clear Timer1 Interrupt Flag

}

Timer

Clock

Input

TxIF

TMRx

34 01 23

567 0

PRx

Cleared by user software Cleared by user software

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 25 26

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Microchip Technology dsPIC33F Family Manual de usuario Pagina 11