mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 119
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mc68hc908lj24
Manufacturer Part Number
mc68hc908lj24
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908LJ24.pdf
(464 pages)
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MC68HC908LJ24/LK24 — Rev. 2.1
Freescale Semiconductor
4. Calculate N:
5. Calculate and verify the adequacy of the VCO and bus
The relationship between the VCO frequency, f
reference frequency, f
where N is the integer range multiplier, between 1 and 4095.
In cases where desired bus frequency has some tolerance,
choose f
requirements (such as modules which are clocked by CGMXCLK),
cost requirements, or ideally, as high as the specified range
allows. See
reference divider, R = 1.
When the tolerance on the bus frequency is tight, choose f
an integer divisor of f
requirement, use the following equation to solve for R with
practical choices of f
lowest R.
frequencies f
Clock Generator Module (CGM)
R
=
RCLK
round R
Section 24. Electrical
VCLK
to a value determined either by other module
N
MAX
and f
=
RCLK
BUSDES
×
round
f
f
RCLK
VCLK
VCLK
f
BUS
BUS
f
------------------------- -
VCLKDES
, and choose the f
f
RCLK
, is
.
R
------------------------------------ -
=
=
=
, and R = 1. If f
f
×
RCLK
2
----------- f
2
----------- f
---------- -
2
f
f
VCLK
P
P
R
R
P
VCLKDES
N
N
×
(
(
–
×
4
RCLK
RCLK
Specifications. Choose the
integer
2
P
Clock Generator Module (CGM)
)
)
RCLK
f
------------------------- -
RCLK
VCLKDES
f
RCLK
Functional Description
VCLK
cannot meet this
that gives the
, and the
Data Sheet
RCLK
119
to
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