mpc5645s Freescale Semiconductor, Inc, mpc5645s Datasheet - Page 20

• Manufacturer Part Number: mpc5645s
• Description: Mpc5645s Microcontroller Data Sheet
• Manufacturer: Freescale Semiconductor, Inc

Overview
The source system clock frequency can be changed via an on-chip programmable clock divider (1 to 2). An additional
programmable peripheral bus clock divider (ratios 1 to ) is also available.
The MPC5645S has two on-chip FMPLLs (primary and secondary). Each features the following:
The primary FMPLL module is for use as a system clock source. The secondary 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 fast external oscillator provides the following features:
The MPC5645S also includes the following oscillators:
1.3.27
The PIT features the following:
1.3.28
The Real Timer Counter supports wake-up from Low Power modes or Real Time Clock generation
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Input clock frequency from 4 MHz to 16 MHz
Lock detect circuitry continuously monitors 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
Input frequency range 4–16 MHz
Square-wave input mode
Oscillator input mode 3.3 V (5.0 V)
Automatic level control
Low power consumption
PLL reference
32 KHz low power external oscillator for slow execution, low power, and RTC
Dedicated internal 128 kHz RC oscillator for low power mode operation and self wake-up
— ±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 start-up from low power modes
— Provides a back-up clock in the event of PLL or External Oscillator clock failure
— Offers an independent clock source for the SWT
— ±5% accuracy across voltage and temperature (after factory trimming)
— Trimming registers to support frequency adjustment with in-application calibration
Eight general purpose interrupt timers
Two dedicated interrupt timers for triggering ADC conversions
32-bit counter resolution
Clocked by system clock frequency
Configurable resolution for different timeout periods
— 1 s resolution for >1 hour period
— 1 ms resolution for 2 second period
Periodic Interrupt Timer (PIT)
Real Time Counter (RTC)
MPC5645S Microcontroller Data Sheet, Rev. 6
Freescale Semiconductor