參數(shù)資料
型號(hào): MC9S12C32CFU
廠(chǎng)商: MOTOROLA INC
元件分類(lèi): 微控制器/微處理器
英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁(yè)數(shù): 73/94頁(yè)
文件大小: 906K
代理商: MC9S12C32CFU
Device User Guide — 9S12C32DGV1/D V01.01
75
With the above inputs the resistance can be calculated as:
The capacitance Cs can now be calculated as:
The capacitance Cp should be chosen in the range of:
The stabilization delays shown in Table A-17 are dependant on PLL operational settings and external
component selection (e.g. crystal, XFC filter).
A.4.3.2 Jitter Information
NOTE:
This section is under construction
The basic functionality of the PLL is shown in Figure A-2. With each transition of the clock fcmp, the
deviation from the reference clock fref is measured and input voltage to the VCO is adjusted
accordingly.The adjustment is done continuously with no abrupt changes in the clock output frequency.
Noise, voltage, temperature and other factors cause slight variations in the control loop resulting in a clock
jitter. This jitter affects the real minimum and maximum clock periods as illustrated in Figure A-3.
n
f
VCO
f
ref
-------------
2
synr
1
+
()
==
R
2
π nf
C
KΦ
-----------------------------
=
C
s
2
ζ
2
π f
C R
----------------------
0.516
f
C R
---------------
ζ 0.9
=
()
;
=
C
s 20
C
p
C
s 10
≤≤
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