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Chapter 2 Introduction
MPC5606BK Microcontroller Reference Manual, Rev. 2
42
Freescale Semiconductor
•
Dedicated 16 MHz fast internal RC oscillator
— Used as default clock source out of reset
— Provides clock for rapid startup from low power modes
— Provides back-up clock in the event of FMPLL or external oscillator clock failure
— Offers independent clock source for the watchdog timer
— 5% accuracy over the operating temperature range
— Trimming registers to support frequency adjustment with in-application calibration
•
Dedicated 128 kHz slow internal RC oscillator for low power mode operation and self wakeup
— 5% accuracy
— Trimming registers to support improve accuracy with in-application calibration
•
32-KHz low power external oscillator for low power real time clock
2.4.13
System timers
The system timers include:
•
Peripheral Interrupt Timer (PIT) timers (including ADC trigger)
•
One Real-Time Counter (RTC) timer
The PIT is an array of timers that can be used to raise interrupts, trigger CTU channels and ADC
conversions. The RTC supports wakeup from low power modes or real-time clock generation.
2.4.13.1
Periodic Interrupt Timer module (PIT)
The PIT features the following:
•
Eight general purpose interrupt timers
•
As many as two interrupt timers for triggering ADC injected conversions (one for 10-bit ADC, one
for 12-bit ADC)
•
As many as four interrupt timers for triggering DMA transfers
•
As many as two interrupt timers for triggering CTU
•
32-bit counter resolution
•
Clocked by system clock frequency
2.4.13.2
Real-Time Counter (RTC)
The RTC features the following:
•
Configurable resolution for different timeout periods
— 1 sec resolution for > 1 hour period
— 1 ms resolution for 2 second period
•
Selectable clock sources
— 128 kHz slow internal RC oscillator
— Divided 16 MHz fast internal RC oscillator
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