mc68hc08ln56 Freescale Semiconductor, Inc, mc68hc08ln56 Datasheet - Page 52

• Manufacturer Part Number: mc68hc08ln56
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Clock Generator Module (CGMB)
ACQ — Acquisition Mode Bit
4.5.3 PLL Multiplier Select Register High
The PLL multiplier select register high contains the programming information for the high byte of the
modulo feedback divider.
MUL[11:8] — Multiplier select bits
PMSH[7:4] — Unimplemented bits
4.5.4 PLL Multiplier Select Register Low
The PLL multiplier select register low contains the programming information for the low byte of the modulo
feedback divider.
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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.
These read/write bits control the high byte of the modulo feedback divider that selects the VCO
frequency multiplier N. (See
the multiplier select registers configures the modulo feedback divider the same as a value of $0001.
Reset initializes the registers to $0040 for a default multiply value of 64.
These bits have no function and always read as logic zeros.
1 = Tracking mode
0 = Acquisition mode
PMSH
$004C
$004D
PMSL
The multiplier select bits have built-in protection such that they cannot be
written when the PLL is on (PLLON = 1).
Reset:
Reset:
Read:
Read:
Write:
Write:
MC68HC08LN56 • MC68HC708LN56 General Release Specification, Rev. 2.1
Figure 4-6. PLL Multiplier Select Register High (PMSH)
MUL7
Figure 4-7. PLL Multiplier Select Register Low (PMSL)
Bit 7
Bit 7
0
0
0
= Unimplemented
MUL6
4.3.3 PLL Circuits
6
0
0
6
1
MUL5
5
0
0
5
0
NOTE
MUL4
and
4
0
0
4
0
4.3.6 Programming the
MUL11
MUL3
3
0
3
0
MUL10
MUL2
2
0
2
0
MUL9
MUL1
1
0
1
0
PLL.) A value of $0000 in
Freescale Semiconductor
MUL8
MUL0
Bit 0
Bit 0
0
0