參數(shù)資料
型號: MC9S12E64MPV
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: MC9S12E-Family Device User Guide V01.04
中文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP112
封裝: LQFP-112
文件頁數(shù): 124/156頁
文件大小: 3077K
代理商: MC9S12E64MPV
Device User Guide — 9S12E128DGV1/D V01.04
124
B.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.
B.4.3.1 XFC Component Selection
This section describes the selection of the XFC components to achieve a good filter characteristics.
Figure B-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 B-4
.
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:
The phase detector relationship is given by:
i
ch
is the current in tracking mode.
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
f
K
1
1V
vco
-----------f
)
=
100
e
60
50
(
-----------------------
)
100
=
= -90.48MHz/V
K
Φ
i
ch
K
V
=
=
316.7Hz/
F
For More Information On This Product,
Go to: www.freescale.com
n
.
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