參數(shù)資料
型號： DSP56F807VF80E
廠商： Freescale Semiconductor
文件頁數(shù)： 24/60頁
文件大?。?/td> 0K
描述： IC DSP 80MHZ 60K FLASH 160-BGA
標(biāo)準(zhǔn)包裝： 126
系列： 56F8xx
核心處理器： 56800
芯體尺寸： 16-位
速度： 80MHz
連通性： CAN，EBI/EMI，SCI，SPI
外圍設(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 32
程序存儲器容量： 136KB（68K x 16）
程序存儲器類型： 閃存
RAM 容量： 6K x 16
電壓 - 電源 (Vcc/Vdd)： 3 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 16x12b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 160-BGA
包裝： 托盤
56F807 Technical Data Technical Data, Rev. 16
30
Freescale Semiconductor
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
3.4.2
Ceramic Resonator
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.
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:
Rz = 1 to 3 MΩ
fc = 8MHz (optimized for 8MHz)
EXTAL XTAL
Rz
fc
Recommended Ceramic Resonator
Parameters:
Rz = 1 to 3 MΩ
fc = 8MHz (optimized for 8MHz)
EXTAL XTAL
Rz
fc
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