in the Interrupt Enable Control (IEC) registers. If the bit is set, themicrocontrollershould respond to the interrupt request by invoking aninterrupt service routine(ISR). The ISR is a function withvoidarguments that handles the interrupt and clears the bit of the IFS before returning. The PIC...
is raised, the INTCON bit 2 (TMR0IF - TMR0 Interrupt Flag) is raised to indicate that the TMR0 interrupt is occurred. The TMR0IF must be cleared in software (BCF INTCON,TMR0IF) for the TMR0 interrupt to be re-enabled.More info about the PIC Interrupts can be found in this link....
When the TMR1 Interrupt is raised, the PIR1 bit 0 (TMR1IF: TMR1 Overflow Interrupt Flag bit) is raised to indicate that the TMR1 interrupt is occurred. The TMR1IF must be cleared in software (BCF PIR1,TMR1IF) for the TMR1 interrupt to be re-enabled. More info about the PIC ...
In our previous tutorial, we only used a software delay to blink an LED, so in this tutorial, we will learn how to use the Timer delay function as well as the Timer ISR (Interrupt Service Routine) and blink two individual LEDs. You can also check out theA...
(0x00). When it goes to 0xFF and rolls over to 0x00, it sets the Timer/Counter Overflow Flag (TOV1) . At this point an interrupt is generated which will clear TOV1 and the process repeats. In order to calculate the frequency of the overflow timer, we will use the following ...
Using the Programmable Interrupt Timer on the MCF5213 ColdFire MicrocontrollerWrite to PCSR to configureprescaler, enable interrupt re-quest, set reload and overwrite bit, and start the PITby: Alfonso Gonzalez
enable interrupt sei(); while(1) { main loop } } Create the function init_TC0 () in main.c. Add the following code: voidinit_TC0(void) { // Set the Timer Mode to CTC TCCR0A|=(1<<WGM01); // Set the value that you want to count to ...
The second, T32 implementation in T32.c (the 32-bit timer is set to overflow and make interrupt every second). voidT32_Init(void) { T2CON=0x0; T3CON=0x0; TMR2=0; TMR3=0; IPC3SET=0x50000; IEC0SET=0x4000; IFS0CLR=0x4000; ...
// Timer A interrupt service routine #pragma vector=TIMER0_A1_VECTOR __interrupt void Timer_A1_ISR( void ) { _DINT(); int den1, den2, rem1, quot, dummy; den1=100; den2=10; switch(__even_in_range(TA0IV, TA0IV_TAIFG))
It is a vital thing. Except for a few cases where entering the ISR implicitely clears the IFG bit (e.g. in timer CCR0 ISR), the interrupt is still pending until the IFG bit is cleared. If you set GIE before you cleared the IFG bit that cause the current interrupt, the CPU would...