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HD6473434F16 参数 Datasheet PDF下载

HD6473434F16图片预览
型号: HD6473434F16
PDF下载: 下载PDF文件 查看货源
内容描述: 12伏不能应用于S -掩模模型(单电源规格) ,因为这可能会永久损坏设备。 [12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.]
分类和应用: 外围集成电路微控制器可编程只读存储器时钟
文件页数/大小: 752 页 / 2557 K
品牌: HITACHI [ HITACHI SEMICONDUCTOR ]
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6.2  
Oscillator Circuit  
6.2.1  
Oscillator (Generic Device)  
If an external crystal is connected across the EXTAL and XTAL pins, the on-chip oscillator circuit  
generates a system clock signal. Alternatively, an external clock signal can be applied to the  
EXTAL pin.  
Connecting an External Crystal  
Circuit Configuration: An external crystal can be connected as in the example in figure 6.2.  
Table 6.1 indicates the appropriate damping resistance Rd. An AT-cut parallel resonance crystal  
should be used.  
CL1  
EXTAL  
XTAL  
Rd  
CL1 = C L2 = 10 pF to 22 pF  
CL2  
Figure 6.2 Connection of Crystal Oscillator (Example)  
Table 6.1 Damping Resistance  
Frequency  
(MHz)  
1 k  
24  
500  
8
10  
0
1126  
0
Rd max ()  
200  
0
Crystal Oscillator: Figure 6.3 shows an equivalent circuit of the crystal resonator. The crystal  
resonator should have the characteristics listed in table 6.2.  
91  
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