mc9s12vr48 Freescale Semiconductor, Inc, mc9s12vr48 Datasheet - Page 23

• Manufacturer Part Number: mc9s12vr48
• Description: S12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

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1.4.8
Freescale Semiconductor
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Loop control Pierce oscillator using 4 MHz to 16 MHz crystal
— Current gain control on amplitude output
— Signal with low harmonic distortion
— Low power
— Good noise immunity
— Eliminates need for external current limiting resistor
— Transconductance sized for optimumstart-up margin for typical crystals
— Oscillator pins shared with GPIO functionality
Factory trimmed internal reference clock
— Frequency: 1 MHz
— Trimmed accuracy over –40˚C to +105˚C ambient temperature range: ±1.3%
Phase-locked-loop clock frequency multiplier
— No external components required
— Reference divider and multiplier allow large variety of clock rates
— Automatic bandwidth control mode for low-jitter operation
— Automatic frequency lock detector
— Configurable option to spread spectrum for reduced EMC radiation (frequency modulation)
— Reference clock sources:
Real time interrupt (RTI)
Clock monitor (CM)
System reset generation
Power-on reset (POR)
Illegal address detection with reset
Low-voltage detection with interrupt or reset
Computer operating properly (COP) watchdog with option to run on internal RC oscillator
— Configurable as window COP for enhanced failure detection
– Internal 1 MHz RC oscillator (IRC)
Main External Oscillator (XOSCLCP)
Internal RC Oscillator (IRC)
Internal Phase-Locked Loop (IPLL)
Clock and Power Management Unit (CPMU)
System Integrity Support
MC9S12VR Family Reference Manual, Rev. 2.2
Preliminary - Subject to Change Without Notice
Device Overview MC9S12VR-Family
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