Datasheet

Clock Functions
Technical Data MC68HC912DT128A — Rev 4.0
176 Clock Functions MOTOROLA
Read anytime, refer to each bit for write conditions.
LOCKIF — PLL Lock Interrupt Flag
0 = No change in LOCK bit.
1 = LOCK condition has changed, either from a locked state to an
unlocked state or vice versa.
To clear the flag, write one to this bit in PLLFLG. Cleared in limp-home
mode.
LOCK — Locked Phase Lock Loop Circuit
Regardless of the bandwidth control mode (automatic or manual):
0 = PLL VCO is not within the desired tolerance of the target
frequency.
1 = After the phase lock loop circuit is turned on, indicates the PLL
VCO is within the desired tolerance of the target frequency.
Write has no effect on LOCK bit. This bit is cleared in limp-home mode as
the lock detector cannot operate without the reference frequency.
LHIF — Limp-Home Interrupt Flag
0 = No change in LHOME bit.
1 = LHOME condition has changed, either entered or exited limp-
home mode.
To clear the flag, write one to this bit in PLLFLG.
LHOME — Limp-Home Mode Status
0 = MCU is operating normally, with EXTALi clock available for
generating clocks or as PLL reference.
1 = Loss of reference clock. CGM delivers PLL VCO limp-home
frequency to the MCU.
For Limp-Home mode, see Limp-Home and Fast STOP Recovery
modes.
Bit 7654321Bit 0
LOCKIFLOCK0000LHIFLHOME
RESET: 00000000
PLLFLG — PLL Flags $003B
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
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