PXN20RM Datasheet, PDF (504/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

Periodic Interrupt Timer (PIT)
Timer 8 is used for triggering only. Timer 8 is started by writing a 1 to bit TEN in the TCTRL8 register.
The following example code matches the described setup:
// turn on PIT
PIT_REG_P->pit_CTRL = 0x00;
// Timer 1
PIT_REG_P->pit_LDVAL1 = 0x0003E7FF; // setup Timer 1 for 256000 cycles
PIT_REG_P->pit_TCTRL1 |= 1<<1; // enable Timer 1 interrupts
PIT_REG_P->pit_EN |= 1<<1; // start timer 1
// Timer 8
PIT_REG_P->pit_LDVAL8 = 0x0016E35F; // setup timer 8 for 1500000 cycles
// timer 8 can’t generate interrupts -> no settings needed for trigger
PIT_REG_P->pit_EN |= 1<<8; // start timer 8
22-10
PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor