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參數(shù)資料
| 型號： | DSP56F805FV80E |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | 16-bit Digital Signal Controllers |
| 中文描述： | 16位數(shù)字信號控制器 |
| 文件頁數(shù)： | 29/56頁 |
| 文件大小： | 415K |
| 代理商： | DSP56F805FV80E |
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External Clock Operation
56F805 Technical Data, Rev. 15
Freescale Semiconductor
29
as a typical circuit board trace capacitance the parallel load capacitance presented to the crystal is 9pF as
determined by the following equation:
This is the value load capacitance that should be used when selecting a crystal and determining the actual
frequency of operation of the crystal oscillator circuit.
Figure 3-7 Connecting to a Crystal Oscillator
3.5.2
It is also possible to drive the internal oscillator with a ceramic resonator, assuming the overall system
design can tolerate the reduced signal integrity. In
Figure 3-8
, a typical ceramic resonator circuit is shown.
Refer to supplier’s recommendations when selecting a ceramic resonator and associated components. The
resonator and components should be mounted as close as possible to the EXTAL and XTAL pins. The
internal 56F80x oscillator circuitry is designed to have no external load capacitors present. As shown in
Figure 3-7
no external load capacitors should be used.
Ceramic Resonator
Figure 3-8 Connecting a Ceramic Resonator
Note:
Freescale recommends only two terminal ceramic resonators vs. three terminal resonators
(which contain an internal bypass capacitor to ground).
CL =
CL1 * CL2
CL1 + CL2
+ Cs =
+ 3 = 6 + 3 = 9pF
12 * 12
12 + 12
Recommended External Crystal
Parameters:
R
z
= 1 to 3 M
Ω
f
c
= 8MHz (optimized for 8MHz)
EXTAL XTAL
R
z
f
c
Recommended Ceramic Resonator
Parameters:
R
z
= 1 to 3 M
Ω
f
c
= 8MHz (optimized for 8MHz)
EXTAL XTAL
R
z
f
c
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相關代理商/技術參數(shù) |
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|---|---|
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| DSP56F805FV80E | 制造商:Freescale Semiconductor 功能描述:DSP LQFP144 3.6V |
| DSP56F805PB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:56F805 16-Bit Hybrid Controller Product Brief |
| DSP56F807 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:56F807 16-bit Hybrid Processor |
| DSP56F807EVM | 功能描述:開發(fā)板和工具包 - 其他處理器 Evaluation Kit For DSP56F807 RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓: |
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