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TC1784
System Control Unit (SCU)
User´s Manual
3-18
V1.1, 2011-05
32-bit SCU, V1.18
In Prescaler Mode the reference frequency
f
OSC
is only divided down by a factor K1.
The output frequency is given by
(3.9)
Freerunning Mode
In Freerunning Mode the base frequency output of the Voltage Controlled Oscillator
(VCO)
f
VCObase
is only divided down by a factor K2.
The output frequency is given by
(3.10)
Configuration and Operation of the Freerunning Mode
In Freerunning Mode, the PLL_ERAY is running at its VCO base frequency and
f
PLL_ERAY
is derived from
f
VCO
only by the K2-Divider.
The Freerunning Mode is entered after each System Reset.
Figure 3-10 PLL_ERAY Free-Running Mode Diagram
fPLL
fOSC
K1
--------------
=
fPLL
fVCObase
K2
---------------------------
=
PLLERAY _FreeRunning _Mode.vsd
PLL_ERAY Block
VCO
K2-
Divider
N-
Divider
Lock
Detect.
f
PLL_ERAY
f
VCO
f
DIV
f
REF
PLLERAYCON 0.VCOBYP
M
U
X
0
1
PLLERAYCON 0.FINDIS
'1'
Содержание TC1784
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