參數(shù)資料
型號(hào)： DSP56F827FG80E
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 25/60頁(yè)
文件大?。?/td> 0K
描述： IC HYBRID CTRLR 16BIT 128-LQFP
標(biāo)準(zhǔn)包裝： 72
系列： 56F8xx
核心處理器： 56800
芯體尺寸： 16-位
速度： 80MHz
連通性： EBI/EMI，SCI，SPI，SSI
外圍設(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 64
程序存儲(chǔ)器容量： 136KB（68K x 16）
程序存儲(chǔ)器類(lèi)型： 閃存
RAM 容量： 5K x 16
電壓 - 電源 (Vcc/Vdd)： 2.25 V ~ 2.75 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 10x12b
振蕩器型： 外部
工作溫度： -40°C ~ 85°C
封裝/外殼： 128-LQFP
包裝： 托盤(pán)
External Clock Operation
56F827 Technical Data, Rev. 12
Freescale Semiconductor
31
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 3-9 Connecting to a Crystal Oscillator Circuit
3.6.2
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. A typical ceramic resonator circuit is shown in
Figure 3-10. The resonator and components should be mounted as close as possible to the EXTAL and
XTAL pins. The internal 56F82x oscillator circuitry is designed to have no external load capacitors
present. As shown in Figure 3-9, no external load capacitors should be used.
Figure 3-10 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 3MΩ
fc = 4MHz (optimized for 4MHz)
EXTAL XTAL
Rz
fc
EXTAL XTAL
Rz
fc
Recommended Ceramic Resonator
Parameters:
Rz = 1 to 3 MΩ
fc = 4MHz (optimized for 4MHz)
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