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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  
FIGURE 3-1:  
CRYSTAL/CERAMIC  
RESONATOROPERATION  
(HS OR HSPLL  
3.0  
3.1  
OSCILLATOR  
CONFIGURATIONS  
CONFIGURATION)  
Oscillator Types  
(1)  
C1  
The PIC18F45J10 family of devices can be operated in  
five different oscillator modes:  
OSC1  
To  
Internal  
Logic  
1. HS  
High-Speed Crystal/Resonator  
(3)  
RF  
XTAL  
2. HSPLL High-Speed Crystal/Resonator  
with Software PLL Control  
Sleep  
OSC2  
3. EC  
External Clock with FOSC/4 Output  
(1)  
(2)  
RS  
PIC18F45J10  
C2  
4. ECPLL External Clock with Software PLL  
Control  
Note 1: See Table 3-1 and Table 3-2 for initial values of  
5. INTRC Internal 31 kHz Oscillator  
C1 and C2.  
Four of these are selected by the user by programming  
the FOSC<2:0> Configuration bits. The fifth mode  
(INTRC) may be invoked under software control; it can  
also be configured as the default mode on device  
Resets.  
2: A series resistor (RS) may be required for AT  
strip cut crystals.  
3: RF varies with the oscillator mode chosen.  
TABLE 3-1:  
CAPACITOR SELECTION FOR  
CERAMIC RESONATORS  
3.2  
Crystal Oscillator/Ceramic  
Resonators (HS Modes)  
Typical Capacitor Values Used:  
In HS or HSPLL Oscillator modes, a crystal or ceramic  
resonator is connected to the OSC1 and OSC2 pins to  
establish oscillation. Figure 3-1 shows the pin  
connections.  
Mode  
Freq.  
OSC1  
OSC2  
HS  
8.0 MHz  
16.0 MHz  
27 pF  
22 pF  
27 pF  
22 pF  
The oscillator design requires the use of a parallel cut  
crystal.  
Capacitor values are for design guidance only.  
These capacitors were tested with the resonators  
listed below for basic start-up and operation. These  
values are not optimized.  
Note:  
Use of a series cut crystal may give a fre-  
quency out of the crystal manufacturer’s  
specifications.  
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.  
See the notes following Table 3-2 for additional  
information.  
Resonators Used:  
4.0 MHz  
8.0 MHz  
16.0 MHz  
© 2009 Microchip Technology Inc.  
DS39682E-page 27  
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