mc68hc908mr24 Freescale Semiconductor, Inc, mc68hc908mr24 Datasheet - Page 113

• Manufacturer Part Number: mc68hc908mr24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

8.4.2 Phase-Locked Loop Circuit (PLL)
8.4.2.1 PLL Circuits
MC68HC908MR24 — Rev. 4.1
Freescale Semiconductor
$005C
$005D
$005E
Addr.
PLL Bandwidth Control Register
PLL Programming Register
Register Name
PLL Control Register
See page 124.
See page 126.
See page 128.
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:
(PBWC)
(PCTL)
•
•
•
•
•
Figure 8-2. CGM I/O Register Summary
(PPG)
Voltage-controlled oscillator (VCO)
Modulo VCO frequency divider
Phase detector
Loop filter
Lock detector
Reset:
Reset:
Reset:
Read:
Read:
Read:
Write:
Write:
Write:
Clock Generator Module (CGM)
PLLIE
AUTO
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
0
0
0
4
VRS7
Clock Generator Module (CGM)
R
R
3
1
1
0
0
0
VRS6
R
R
2
1
1
0
0
1
Advance Information
VRS5
R
R
1
1
1
0
0
1
VRS4
Bit 0
R
R
1
1
0
0
0
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