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PIC18F4580-I/PT 参数 Datasheet PDF下载

PIC18F4580-I/PT图片预览
型号: PIC18F4580-I/PT
PDF下载: 下载PDF文件 查看货源
内容描述: 28 /40/ 44引脚增强型闪存微控制器与ECAN技术, 10位A / D和纳瓦技术 [28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology]
分类和应用: 闪存微控制器和处理器外围集成电路时钟
文件页数/大小: 490 页 / 8912 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC18F2480/2580/4480/4580  
An external clock source may also be connected to the  
OSC1 pin in the HS mode, as shown in Figure 3-2.  
TABLE 3-2:  
CAPACITOR SELECTION FOR  
CRYSTAL OSCILLATOR  
Typical Capacitor Values  
FIGURE 3-2:  
EXTERNAL CLOCK  
INPUT OPERATION  
(HS OSCILLATOR  
CONFIGURATION)  
Crystal  
Freq  
Tested:  
Osc Type  
C1  
C2  
LP  
XT  
HS  
32 kHz  
200 kHz  
1 MHz  
4 MHz  
4 MHz  
8 MHz  
20 MHz  
33 pF  
15 pF  
33 pF  
27 pF  
27 pF  
22 pF  
15 pF  
33 pF  
15 pF  
33 pF  
27 pF  
27 pF  
22 pF  
15 pF  
OSC1  
Clock from  
Ext. System  
PIC18FXXXX  
(HS Mode)  
OSC2  
Open  
3.3  
External Clock Input  
Capacitor values are for design guidance only.  
The EC and ECIO Oscillator modes require an external  
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.  
These capacitors were tested with the crystals listed  
below for basic start-up and operation. These values  
are not optimized.  
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.  
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 3-3 shows the pin connections for the EC  
Oscillator mode.  
See the notes following this table for additional  
information.  
Crystals Used:  
FIGURE 3-3:  
EXTERNAL CLOCK  
INPUT OPERATION  
(EC CONFIGURATION)  
32 kHz  
200 kHz  
1 MHz  
4 MHz  
8 MHz  
20 MHz  
OSC1/CLKI  
Clock from  
Ext. System  
PIC18FXXXX  
OSC2/CLKO  
Note 1: Higher capacitance increases the stability  
of the oscillator but also increases the  
start-up time.  
FOSC/4  
2: When operating below 3V VDD, or when  
using certain ceramic resonators at any  
voltage, it may be necessary to use the  
HS mode or switch to a crystal oscillator.  
The ECIO Oscillator mode functions like the EC mode,  
except that the OSC2 pin becomes an additional  
general purpose I/O pin. The I/O pin becomes bit 6 of  
PORTA (RA6). Figure 3-4 shows the pin connections  
for the ECIO Oscillator mode.  
3: Since each resonator/crystal has its own  
characteristics, the user should consult  
the resonator/crystal manufacturer for  
FIGURE 3-4:  
EXTERNAL CLOCK  
INPUT OPERATION  
(ECIO CONFIGURATION)  
appropriate  
values  
of  
external  
components.  
4: Rs may be required to avoid overdriving  
crystals with low drive level specification.  
OSC1/CLKI  
PIC18FXXXX  
I/O (OSC2)  
Clock from  
Ext. System  
5: Always verify oscillator performance over  
the VDD and temperature range that is  
expected for the application.  
RA6  
DS39637D-page 30  
© 2009 Microchip Technology Inc.  
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