Datasheet

Clock Generator Module (CGM)
MC68HC908GP32 Data Sheet, Rev. 10
74 Freescale Semiconductor
AUTO — Automatic Bandwidth Control Bit
This read/write bit selects automatic or manual bandwidth control. When initializing the PLL for manual
operation (AUTO = 0), clear the
ACQ bit before turning on the PLL. Reset clears the AUTO bit.
1 = Automatic bandwidth control
0 = Manual bandwidth control
LOCK — Lock Indicator Bit
When the AUTO bit is set, LOCK is a read-only bit that becomes set when the VCO clock, CGMVCLK,
is locked (running at the programmed frequency). When the AUTO bit is clear, LOCK reads as logic 0
and has no meaning. The write one function of this bit is reserved for test, so this bit must always be
written a 0. Reset clears the LOCK bit.
1 = VCO frequency correct or locked
0 = VCO frequency incorrect or unlocked
ACQ — Acquisition Mode Bit
When the AUTO bit is set,
ACQ is a read-only bit that indicates whether the PLL is in acquisition mode
or tracking mode. When the AUTO bit is clear,
ACQ is a read/write bit that controls whether the PLL is
in acquisition or tracking mode.
In automatic bandwidth control mode (AUTO = 1), the last-written value from manual operation is
stored in a temporary location and is recovered when manual operation resumes. Reset clears this bit,
enabling acquisition mode.
1 = Tracking mode
0 = Acquisition mode
5.5.3 PLL Multiplier Select Register High
The PLL multiplier select register high (PMSH) contains the programming information for the high byte of
the modulo feedback divider.
MUL11–MUL8 — Multiplier Select Bits
These read/write bits control the high byte of the modulo feedback divider that selects the VCO
frequency multiplier N. (See 5.3.3 PLL Circuits and 5.3.6 Programming the PLL.) A value of $0000 in
Address: $0037
Bit 7654321Bit 0
Read:
AUTO
LOCK
ACQ
0000
R
Write:
Reset:00000000
= Unimplemented R = Reserved
Figure 5-5. PLL Bandwidth Control Register (PBWC)
Address: $0038
Bit 7654321Bit 0
Read: 0 0 0 0
MUL11 MUL10 MUL9 MUL8
Write:
Reset:00000000
= Unimplemented
Figure 5-6. PLL Multiplier Select Register High (PMSH)