參數(shù)資料
型號(hào): 9S12B128DGV1
英文描述: 9S12B128 Device Guide
中文描述: 9S12B128設(shè)備指南
文件頁數(shù): 108/128頁
文件大?。?/td> 1823K
代理商: 9S12B128DGV1
Device User Guide — 9S12B128DGV1/D V01.11
108
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-3 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-21
.
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
=
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
-----------------------
e
60
50
(
-----------------------
)
100
= -90.48MHz/V
K
Φ
i
ch
K
V
=
=
316.7Hz/
相關(guān)PDF資料
PDF描述
9S12C128DGV1 MC9S12C Family Device User Guide
9S12D32DGV1 9S12DGDJ64DGV1 Device Guide. also covers 9S12D64. 9S12A64. 9S12D32. and 9S12A32 devices
9S12DJ64DGV1 9S12DJ64DG Device Guide. also covers 9S12D64. 9S12A64. 9S12D32 and 9S12A32 devices
9S12DJ64-ZIP_PART2 MC9S12DJ64 Users Guides. zip format. part 2
9S12DP256BDGV2 9S12Dx256B Device Guide. also covers C derivatives and 9S12Ax256 devices
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
9S12C128DGV1 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MC9S12C Family Device User Guide
9S12D32DGV1 制造商:未知廠家 制造商全稱:未知廠家 功能描述:9S12DGDJ64DGV1 Device Guide. also covers 9S12D64. 9S12A64. 9S12D32. and 9S12A32 devices
9S12DJ64DGV1 制造商:未知廠家 制造商全稱:未知廠家 功能描述:9S12DJ64DG Device Guide. also covers 9S12D64. 9S12A64. 9S12D32 and 9S12A32 devices
9S12DP256BDGV1 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Automotive applications
9S12DP256BDGV2 制造商:未知廠家 制造商全稱:未知廠家 功能描述:9S12Dx256B Device Guide. also covers C derivatives and 9S12Ax256 devices