mc68hc908mr8 Freescale Semiconductor, Inc, mc68hc908mr8 Datasheet - Page 115

• Manufacturer Part Number: mc68hc908mr8
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

8.4.2 Phase-Locked Loop Circuit (PLL)
8.4.2.1 PLL Circuits
MC68HC908MR8 — Rev 4.1
Freescale Semiconductor
$005C
$005D
$005E
Addr.
PLL Bandwidth Control Reg-
PLL Programming Register
Register Name
PLL Control Register
See page 126.
See page 129.
See page 131.
ister (PBWC)
The PLL is a frequency generator that can operate in either acquisition
mode or tracking mode, depending on the accuracy of the output
frequency. The PLL can change between acquisition and tracking
modes either automatically or manually.
The PLL consists of these circuits:
(PCTL)
(PPG)
•
•
Figure 8-2. CGM I/O Register Summary
Voltage-controlled oscillator (VCO)
Modulo VCO frequency divider
Read
Read
Read
Write
Write
Write
Re-
set:
Re-
set:
Re-
set:
Clock Generator Module (CGM)
:
:
:
:
:
:
AUTO
PLLIE
MUL7
Bit 7
R
0
0
0
= Reserved
LOCK
MUL6
PLLF
R
R
6
0
0
1
PLLON
MUL5
ACQ
5
1
0
1
MUL4
BCS
XLD
4
0
0
0
VRS7
Clock Generator Module (CGM)
R
R
3
1
1
0
0
0
VRS6
R
R
Functional Description
2
1
1
0
0
1
VRS5
Technical Data
R
R
1
1
1
0
0
1
VRS4
Bit 0
R
R
1
1
0
0
0
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