mc9s12vr48 Freescale Semiconductor, Inc, mc9s12vr48 Datasheet - Page 118

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

Clock, Reset and Power Management (S12CPMU_UHV)
4.1.1
The Pierce Oscillator (XOSCLCP) contains circuitry to dynamically control current gain in the output
amplitude. This ensures a signal with low harmonic distortion, low power and good noise immunity.
The Voltage Regulator (VREGAUTO) has the following features:
The Phase Locked Loop (PLL) has the following features:
The Internal Reference Clock (IRC1M) has the following features:
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Supports crystals or resonators from 4MHz to 16MHz.
High noise immunity due to input hysteresis and spike filtering.
Low RF emissions with peak-to-peak swing limited dynamically
Transconductance (gm) sized for optimum start-up margin for typical crystals
Dynamic gain control eliminates the need for external current limiting resistor
Integrated resistor eliminates the need for external bias resistor
Low power consumption: Operates from internal 1.8V (nominal) supply, Amplitude control limits
power
Input voltage range from 6 to 18V
Low-voltage detect (LVD) with low-voltage interrupt (LVI)
Power-on reset (POR)
Low-voltage reset (LVR)
On Chip Temperature Sensor and Bandgap Voltage measurement via internal ATD channel.
Voltage Regulator providing Full Performance Mode (FPM) and Reduced Performance Mode
(RPM)
highly accurate and phase locked frequency multiplier
Configurable internal filter for best stability and lock time
Frequency modulation for defined jitter and reduced emission
Automatic frequency lock detector
Interrupt request on entry or exit from locked condition
Reference clock either external (crystal) or internal square wave (1MHz IRC1M) based.
PLL stability is sufficient for LIN communication in slave mode, even if using IRC1M as reference
clock
Frequency trimming
(A factory trim value for 1MHz is loaded from Flash Memory into the IRCTRIM register after
reset, which can be overwritten by application if required)
Temperature Coefficient (TC) trimming.
(A factory trim value is loaded from Flash Memory into the IRCTRIM register to turn off TC
trimming after reset. Application can trim the TC if required by overwriting the IRCTRIM
register).
Features
MC9S12VR Family Reference Manual,
Preliminary - Subject to Change Without Notice
Rev. 2.2
Freescale Semiconductor