MC68HC908AZ32ACFU MOTOROLA [Motorola, Inc], MC68HC908AZ32ACFU Datasheet - Page 144
MC68HC908AZ32ACFU
Manufacturer Part Number
MC68HC908AZ32ACFU
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AZ32ACFU.pdf
(468 pages)
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Clock Generator Module (CGM)
Advance Information
144
NOTE:
For proper operation,
Exceeding the recommended maximum bus frequency or VCO
frequency can crash the MCU.
Freescale Semiconductor, Inc.
5. Calculate the bus frequency, f
6. If the calculated f
7. Using the value 4.9152 MHz for f
8. Calculate the VCO center-of-range frequency, f
9. Program the PLL registers accordingly:
For More Information On This Product,
f
application, select another f
range multiplier, L. The linear range multiplier controls the
frequency range of the PLL.
center-of-range frequency is the midpoint between the minimum
and maximum frequencies attainable by the PLL.
BUSDES
Example: f
Clock Generator Module (CGM)
Example: f
Go to: www.freescale.com
Example:
.
Example:
f
CGMVCLK
CGMVCLK
CGMVRS
f
BUS
f
f
bus
CGMVRS
BUS
f
L
CGMVRS
L
=
is not within the tolerance limits of your
=
=
=
=
------------------------------- -
4.9152 MHz
round
= 8
= 7
f
----------------------- -
32 MHz
------------------- -
N f
CGMVCLK
32 MHz
–
= L
4
f
4
BUSDES
CGMVCLK
CGMRCLK
4 MHz = 32 MHz
4.9152 MHz = 34.4 MHz
BUS
f
----------------------- -
CGMVCLK
f
f
=
NOM
NOM
NOM
, and compare f
8 MHz
or another f
=
, calculate the VCO linear
7
f
--------------- -
NOM
2
68HC908AZ32A — Rev 0.0
RCLK
CGMVRS
.
BUS
.
with
MOTOROLA
. The
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