Freescale Semiconductor, Inc.
Clock Functions
Limp-Home and Fast STOP Recovery modes
ACQ — Not in Acquisition
If AUTO = 1 (ACQ is Read Only)
0 = PLL VCO is not within the desired tolerance of the target
frequency. The loop filter is in high bandwidth, acquisition
mode.
1 = After the phase lock loop circuit is turned on, indicates the PLL
VCO is within the desired tolerance of the target frequency.
The loop filter is in low bandwidth, tracking mode.
If AUTO = 0
0 = High bandwidth PLL loop selected
1 = Low bandwidth PLL loop selected
PSTP — Pseudo-STOP Enable
0 = Pseudo-STOP oscillator mode is disabled
1 = Pseudo-STOP oscillator mode is enabled
In Pseudo-STOP mode, the oscillator is still running while the MCU is
maintained in STOP mode. This allows for a faster STOP recovery
and reduces the mechanical stress and aging of the resonator in case
frequent STOP conditions at the expense of a slightly increased
power consumption.
LHIE — Limp-Home Interrupt Enable
0 = Limp-Home interrupt is disabled
1 = Limp-Home interrupt is enabled
Forced to 0 when VDDPLL is at VSS level.
NOLHM —No Limp-Home Mode
0 = Loss of reference clock forces the MCU in limp-home mode.
1 = Loss of reference clock causes standard Clock Monitor reset.
Read anytime; Normal modes: write once; Special modes: write
anytime. Forced to 1 when VDDPLL is at VSS level.
68HC(9)12D60 — Rev 4.0
MOTOROLA
Advance Information
Clock Functions
165
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