參數(shù)資料
型號(hào): 9S12DP256BDGV2
英文描述: 9S12Dx256B Device Guide. also covers C derivatives and 9S12Ax256 devices
中文描述: 9S12Dx256B設(shè)備指南。也包括C衍生物和9S12Ax256設(shè)備
文件頁數(shù): 107/126頁
文件大?。?/td> 1809K
代理商: 9S12DP256BDGV2
MC9S12DJ64 Device User Guide — V01.17
107
A.5.3 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.5.3.1 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 K
1
, f
1
and i
ch
from
Table A-16
.
The grey boxes show the calculation for f
VCO
= 50MHz and f
ref
= 1MHz. E.g., these frequencies are used
for f
OSC
= 4MHz and a 25MHz bus clock.
The VCO Gain at the desired VCO frequency is approximated by:
f
f
(
)
K
1
1V
=
100
=
NOTES
:
1. Depending on the crystal a damping series resistor might be necessary
2. f
osc
= 4MHz, C = 22pF.
3. Maximum value is for extreme cases using high Q, low frequency crystals
4. Only valid if Pierce oscillator/external clock mode is selected
f
osc
1
refdv+1
f
ref
Phase
Detector
VCO
K
V
1
synr+1
f
vco
Loop Divider
K
Φ
1
2
f
cmp
C
s
R
C
p
VDDPLL
XFC Pin
K
V
K
1
e
-----------------------
e
60
---------------50
)
100
= -90.48MHz/V
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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9S12DT128DGV2D 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:MC9S12DT128 Device User Guide V02.09
9S12DT256DGV3 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:MC9S12DT256 Device User Guide V03.03