MC68HC08AZ60ACFU MOTOROLA [Motorola, Inc], MC68HC08AZ60ACFU Datasheet - Page 148
MC68HC08AZ60ACFU
Manufacturer Part Number
MC68HC08AZ60ACFU
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC08AZ60ACFU.pdf
(480 pages)
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Clock Generator Module (CGM)
Advance Information
148
NOTE:
For proper operation,
Exceeding the recommended maximum bus frequency or VCO
frequency can crash the MCU.
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:
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
a. In the upper four bits of the PLL programming register (PPG),
b. In the lower four bits of the PLL programming register (PPG),
Example: f
Clock Generator Module (CGM)
program the binary equivalent of N.
program the binary equivalent of L.
Example:
.
Example:
CGMVRS
f
BUS
f
f
bus
CGMVRS
BUS
f
L
CGMVRS
L
=
is not within the tolerance limits of your
=
=
=
------------------------------- -
4.9152 MHz
round
= 7
f
----------------------- -
32 MHz
------------------- -
CGMVCLK
32 MHz
–
= L
4
f
4
BUSDES
CGMVCLK
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
MC68HC08AZ60A — Rev 0.0
2
RCLK
CGMVRS
.
BUS
.
with
MOTOROLA
. The
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