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S12SCIV2/D 데이터시트(PDF) 109 Page - Freescale Semiconductor, Inc

부품명 S12SCIV2/D
상세설명  Device User Guide V01.18
PDF  130 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

S12SCIV2/D 데이터시트(HTML) 109 Page - Freescale Semiconductor, Inc

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MC9S12H256 Device User Guide — V01.18
A.4.3 Phase Locked Loop
The oscillator provides the reference clock for the PLL. The PLL´s Voltage Controlled Oscillator (VCO)
is also the system clock source in self clock mode.
A.4.3.1 XFC Component Selection
This section describes the selection of the XFC components to achieve a good filter characteristics.
Figure A-2 Basic PLL functional diagram
The following procedure can be used to calculate the resistance and capacitance values using typical
values for K1, f1 and ich from Table A-15.
The VCO Gain at the desired VCO output frequency is approximated by:
The phase detector relationship is given by:
ich is the current in tracking mode.
3. XCLKS =1 during reset
fosc
1
refdv+1
fref
Phase
Detector
VCO
KV
1
synr+1
fvco
Loop Divider
KΦ
1
2
∆
fcmp
Cs
R
Cp
VDDPLL
K
V
K
1 e
f
1
f
vco
–
()
K
1
1V
⋅
-----------------------
⋅
=
KΦ
i
ch KV
⋅
=
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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