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68HC705JJ7_1 参数 Datasheet PDF下载

68HC705JJ7_1图片预览
型号: 68HC705JJ7_1
PDF下载: 下载PDF文件 查看货源
内容描述: 常规版本规格 [General Release Specification]
分类和应用:
文件页数/大小: 230 页 / 5548 K
品牌: FREESCALE [ Freescale ]
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Freescale Semiconductor, Inc.  
General Description  
OSC1 and OSC2 Pins  
The load capacitance values used in the oscillator circuit design should  
include all stray capacitances. The ceramic resonator and components  
should be mounted as close as possible to the pins for startup  
stabilization and to minimize output distortion. An internal startup resistor  
of approximately 2 Mcan be provided between OSC1 and OSC2 for  
the ceramic resonator type oscillator by use of the OSCRES bit in the  
MOR.  
1.7.3 RC Osc illa tor  
The lowest cost oscillator is the RC oscillator configuration where a  
resistor is connected between the two oscillator pins as shown in Figure  
1-3 (b). The internal startup resistor of approximately 2 Mis not  
recommended between OSC1 and OSC2 for the RC-type oscillator.  
The selection of the RC oscillator configuration is done by product part  
number selection as described in Section 17. Ordering Information.  
1.7.4 Exte rna l Cloc k  
An external clock from another CMOS-compatible device can be  
connected to the OSC1 input, with the OSC2 input not connected, as  
shown in Figure 1-3 (c). This oscillator can be selected via software.  
This configuration is possible regardless of whether the crystal/ceramic  
resonator or RC oscillator configuration is used.  
1.7.5 Inte rna l Low-Powe r Osc illa tor  
An internal low-power oscillator (LPO) is provided which is the default  
oscillator out of reset. When operating from this internal LPO, the other  
oscillator can be powered down by software to further conserve power.  
The selection of the LPO configuration is done by product part number  
selection as described in Section 17. Ordering Information.  
MC68HC705JJ7/MC68HC705JP7 Rev. 3.0  
General Release Specification  
General Description  
For More Information On This Product,  
Go to: www.freescale.com  
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