On Blackfin Timer

  Hi,
 I am working with Blackfin processor BF534.........
 I am configuring three timers in the PWM_OUT mode.... I am mapping three
timers to three separte interrupt Service routines as shown
below.............I have intialized all the Timers in PWM_OUT, PULSE_HI=0,
IRQ_ENA=PERIOD_CNT=1.........


 void Init_Interrupts()

 {
 // assign core IDs to interrupts
 *pSIC_IAR0 = 0xffffffff;
 *pSIC_IAR1 = 0xffffffff;
 *pSIC_IAR2 = 0xf4ffffff; /////Timer3 ISR-->IVG11
 *pSIC_IAR3 = 0xfffff5f6; /////Timer7 ISR-->IVG12////Timer5 ISR-->IVG13//

 // assign ISRs to interrupt vectors
 register_handler(ik_ivg11, Timer3_ISR); // Timer3 ISR -> IVG 11
 register_handler(ik_ivg12, Timer7_ISR); // Timer7 ISR -> IVG 12
 register_handler(ik_ivg13, Timer5_ISR); // Timer5 ISR -> IVG 13

 // enable Timer0 interrupt
 *pSIC_IMASK |= IRQ_TIMER3|IRQ_TIMER5|IRQ_TIMER7;

 ssync();
 }


 I have written Individual ISR's for all the three timers as given
below......

 EX_INTERRUPT_HANDLER(Timer3_ISR)
 {

 *pTIMER_DISABLE =0x0008;
 ssync();
 // confirm interrupt handling///
 *pTIMER_STATUS |= 0x00000008;//------------------------->>(1)
 ssync();

 }

 EX_INTERRUPT_HANDLER(Timer7_ISR)
 {

 *pTIMER_DISABLE =TIMDIS7;
 ssync();
 // confirm interrupt handling///
 *pTIMER_STATUS |= 0x00080000;------------------------->>(2)
 ssync();

 }


 EX_INTERRUPT_HANDLER(Timer5_ISR)
 {
 *pTIMER_DISABLE =TIMDIS5;
 ssync();

 // confirm interrupt handling///
 *pTIMER_STATUS |= 0x00020000;------------------------->>(3)
 ssync();

 }



 My problem is based on the equations 1, 2 and 3........After the timer
counter reaches the value of the timer period register, it jumps to the
ISR........In the ISR, I am clearing the TIMILx bit of the particular
timers by writing (WIC) to TIMER_STATUS registers.....But the interrupt bit
is cleared (Particular TIMILx bit becomes zero on writing 1 to that
bit(wruite 1 to clear)) only in Equation (1)....but not in equation (2) and
(3).......Can you suggest the remedy for my problem.......

 Regards,
 Nithin K S

 PS: Can I use the three different ISR's for three timers....?or should i
map the three timers into same ISR......