参数资料
型号: DSP56F826BU80
厂商: Freescale Semiconductor
文件页数: 22/56页
文件大小: 0K
描述: IC DSP 80MHZ 64KB FLASH 100LQFP
标准包装: 90
系列: 56F8xx
核心处理器: 56800
芯体尺寸: 16-位
速度: 80MHz
连通性: EBI/EMI,SCI,SPI,SSI
外围设备: POR,WDT
输入/输出数: 46
程序存储器容量: 67KB(33.5K x 16)
程序存储器类型: 闪存
RAM 容量: 4.5K x 16
电压 - 电源 (Vcc/Vdd): 2.25 V ~ 2.75 V
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 100-LQFP
包装: 托盘
External Clock Operation
56F826 Technical Data, Rev. 14
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 3-9 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. 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 56F82x oscillator circuitry is designed to have no external load capacitors
present. As shown in Figure 3-10, 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
Recommended Ceramic Resonator
Parameters:
Rz = 1 to 3 MΩ
fc = 4Mhz (optimized for 4MHz)
EXTAL XTAL
Rz
fc
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