NXP Semiconductors MPC5606S - Periodic Interrupt Timer Module (PIT)

Overview
MPC5606S Microcontroller Reference Manual, Rev. 7
Freescale Semiconductor 63
• Source system clock frequency can be changed via an on-chip programmable clock divider
(1 to 2)
• Additional programmable peripheral bus clock divider ratio (1 to 16)
• Two on-chip FMPLLs—the primary module and an auxiliary module
— Each FMPLL features:
– Input clock frequency from 4 MHz to 16 MHz
– Lock detect circuitry continuously monitoring lock status
– Loss Of Clock (LOC) detection for reference and feedback clocks
– On-chip loop filter (for improved electromagnetic interference performance and reduction
of number of external components required)
– Support for frequency ramping from PLL
— The primary FMPLL module is for use as a system clock source; the auxiliary FMPLL is
available for use as an alternate, modulated or non-modulated clock source to eMIOS modules
and as alternate clock to the DCU for pixel clock generation
• The main oscillator provides the following features:
— Input frequency range 4–16 MHz
— Square-wave input mode
— Oscillator input mode 3.3 V (5.0 V)
— Automatic level control
— PLL reference
• MPC5606S includes a 32 KHz low-power external oscillator for slow execution, reduced power
consumption, and Real Time Clock
• Dedicated internal 128 kHz RC oscillator for low-power mode operation and self wakeup
— ±10% accuracy across voltage and temperature (after factory trimming)
— Trimming registers to support improved accuracy with in-application calibration
• Dedicated 16 MHz internal RC oscillator
— Used as default clock source out of reset
— Provides a clock for rapid startup from low-power modes
— Provides a backup clock in the event of PLL or external oscillator clock failure
— Offers an independent clock source for the watchdog timer
— ±5% accuracy across voltage and temperature (after factory trimming)
— Trimming registers to support frequency adjustment with in-application calibration
1.5.20 Periodic Interrupt Timer module (PIT)
The PIT features the following:
• Four general-purpose interrupt timers
• As many as two dedicated interrupt timers for triggering ADC conversions
• 32-bit counter resolution