参数资料
型号: MC56F8025VLD
厂商: Freescale Semiconductor
文件页数: 91/161页
文件大小: 0K
描述: IC DSP 16BIT DUAL HARV 44-LQFP
标准包装: 800
系列: 56F8xxx
核心处理器: 56800E
芯体尺寸: 16-位
速度: 32MHz
连通性: I²C,LIN,SCI,SPI
外围设备: POR,PWM,WDT
输入/输出数: 35
程序存储器容量: 32KB(16K x 16)
程序存储器类型: 闪存
RAM 容量: 2K x 16
电压 - 电源 (Vcc/Vdd): 3 V ~ 3.6 V
数据转换器: A/D 8x12b,D/A 2x12b
振荡器型: 内部
工作温度: -40°C ~ 105°C
封装/外壳: 44-LQFP
包装: 托盘
Ceramic Resonator
56F8035/56F8025 Data Sheet, Rev. 6
Freescale Semiconductor
35
Figure 3-1 External Crystal Oscillator Circuit
3.6 Ceramic Resonator
The internal crystal oscillator circuit is also designed to interface with a ceramic resonator in the frequency
range of 4-8MHz. Figure 3-2 shows the typical 2- and 3-terminal ceramic resonators and their circuits.
Follow the resonator supplier’s recommendations when selecting a resonator, since their parameters
determine the component values required to provide maximum stability and reliable start up. The load
capacitance values used in the resonator circuit design should include all stray layout capacitances. The
resonator and associated components should be mounted as near as possible to the EXTAL and XTAL pins
to minimize output distortion and start-up stabilization time.
Figure 3-2 External Ceramic Resonator Circuit
3.7 External Clock Input - Crystal Oscillator Option
The recommended method of connecting an external clock is illustrated in Figure 3-3. The external clock
source is connected to XTAL and the EXTAL pin is grounded. The external clock input must be generated
using a relatively low impedance driver.
Sample External Crystal Parameters:
Rz = 750 KΩ
Note: If the operating temperature range is limited to
below 85oC (105oC junction), then Rz = 10 Meg Ω
EXTAL XTAL
Rz
CL1
CL2
Crystal Frequency = 4 - 8MHz (optimized for 8MHz)
EXTAL XTAL
Rz
EXTAL XTAL
Rz
Sample External Ceramic Resonator Parameters:
Rz = 750 KΩ
EXTAL XTAL
Rz
C1
CL1
CL2
C2
Resonator Frequency = 4 - 8MHz (optimized for 8MHz)
3 Terminal
2 Terminal
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