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PIC18F25J10-I/SS 参数 Datasheet PDF下载

PIC18F25J10-I/SS图片预览
型号: PIC18F25J10-I/SS
PDF下载: 下载PDF文件 查看货源
内容描述: 28 /40/ 44引脚高性能, RISC微控制器 [28/40/44-Pin High-Performance, RISC Microcontrollers]
分类和应用: 微控制器和处理器外围集成电路光电二极管PC时钟
文件页数/大小: 368 页 / 5652 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC18F45J10 FAMILY  
TABLE 3-2:  
CAPACITOR SELECTION FOR  
CRYSTAL OSCILLATOR  
3.3  
External Clock Input (EC Modes)  
The EC and ECPLL Oscillator modes require an exter-  
nal clock source to be connected to the OSC1 pin.  
There is no oscillator start-up time required after a  
Power-on Reset or after an exit from Sleep mode.  
Typical Capacitor Values  
Crystal  
Freq.  
Tested:  
Osc Type  
C1  
C2  
In the EC Oscillator mode, the oscillator frequency  
divided by 4 is available on the OSC2 pin. This signal  
may be used for test purposes or to synchronize other  
logic. Figure 3-2 shows the pin connections for the EC  
Oscillator mode.  
HS  
4 MHz  
8 MHz  
20 MHz  
27 pF  
22 pF  
15 pF  
27 pF  
22 pF  
15 pF  
Capacitor values are for design guidance only.  
These capacitors were tested with the crystals listed  
below for basic start-up and operation. These values  
are not optimized.  
FIGURE 3-2:  
EXTERNAL CLOCK  
INPUT OPERATION  
(EC CONFIGURATION)  
Different capacitor values may be required to produce  
acceptable oscillator operation. The user should test  
the performance of the oscillator over the expected  
VDD and temperature range for the application.  
OSC1/CLKI  
Clock from  
Ext. System  
PIC18F45J10  
OSC2/CLKO  
See the notes following this table for additional  
information.  
FOSC/4  
Crystals Used:  
4 MHz  
8 MHz  
20 MHz  
An external clock source may also be connected to the  
OSC1 pin in the HS mode, as shown in Figure 3-3. In  
this configuration, the divide-by-4 output on OSC2 is  
not available.  
FIGURE 3-3:  
EXTERNAL CLOCK INPUT  
OPERATION (HS OSC  
CONFIGURATION)  
Note 1: Higher capacitance increases the stability  
of oscillator but also increases the  
start-up time.  
2: Since each resonator/crystal has its own  
characteristics, the user should consult  
the resonator/crystal manufacturer for  
OSC1  
Clock from  
appropriate  
components.  
values  
of  
external  
Ext. System  
PIC18F45J10  
(HS Mode)  
OSC2  
Open  
3: Rs may be required to avoid overdriving  
crystals with low drive level specification.  
4: Always verify oscillator performance over  
the VDD and temperature range that is  
expected for the application.  
DS39682E-page 28  
© 2009 Microchip Technology Inc.  
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