XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 173

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

10.4.2 Phase-Locked Loop Circuit (PLL)
10.4.2.1 Circuits
MC68HC908AZ60A — Rev 2.0
MOTOROLA
PLL Programming Register (PPG)
PLL Bandwidth Control Register
PLL Control Register (PCTL)
Register Name
(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:
Table 10-1. I/O Register Address Summary
Reset:
Reset:
Reset:
Read:
Read:
Read:
Write:
Write:
Write:
Register
Address
•
•
•
Figure 10-2. I/O Register Summary
Voltage-controlled oscillator (VCO)
Modulo VCO frequency divider
Phase detector
AUTO
Bit 7
PLLIE
MUL7
0
0
0
Clock Generator Module (CGM)
$001C
PCTL
= Unimplemented
LOCK
MUL6
PLLF
6
0
0
1
PLLON
MUL5
ACQ
5
1
0
1
PBWC
$001D
MUL4
BCS
XLD
4
0
0
0
$001E
PPG
VRS7
3
1
1
0
0
0
Clock Generator Module (CGM)
VRS6
2
1
1
0
0
1
Functional Description
VRS5
1
1
1
0
0
1
Technical Data
Bit 0
VRS4
1
1
0
0
0
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