Device Overview MC9S12P-Family
1.3.3
On-Chip SRAM
•
Up to 6 Kbytes of general-purpose RAM
1.3.4
Main External Oscillator (XOSC)
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Loop control Pierce oscillator using a 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 optimum start-up margin for typical crystals
1.3.5
Internal RC Oscillator (IRC)
•
Trimmable internal reference clock.
— Frequency: 1 MHz
— Trimmed accuracy over –40˚C to +125˚C ambient temperature range: 1.5%
1.3.6
Internal Phase-Locked Loop (IPLL)
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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:
– External 4–16 MHz resonator/crystal (XOSC)
– Internal 1 MHz RC oscillator (IRC)
1.3.7
System Integrity Support
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Power-on reset (POR)
System reset generation
Illegal address detection with reset
Low-voltage detection with interrupt or reset
Real time interrupt (RTI)
Computer operating properly (COP) watchdog
— Configurable as window COP for enhanced failure detection
S12P-Family Reference Manual, Rev. 1.13
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Freescale Semiconductor
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