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PIC16F818-I/SS 参数 Datasheet PDF下载

PIC16F818-I/SS图片预览
型号: PIC16F818-I/SS
PDF下载: 下载PDF文件 查看货源
内容描述: 二十零分之一十八引脚增强型闪存微控制器采用纳瓦技术 [18/20-Pin Enhanced Flash Microcontrollers with nanoWatt Technology]
分类和应用: 闪存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: 176 页 / 2941 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC16F818/819  
TABLE 4-1:  
Osc Type  
CAPACITOR SELECTION FOR  
CRYSTAL OSCILLATOR (FOR  
DESIGN GUIDANCE ONLY)  
4.0  
4.1  
OSCILLATOR  
CONFIGURATIONS  
Typical Capacitor Values  
Oscillator Types  
Crystal  
Freq  
Tested:  
The PIC16F818/819 can be operated in eight different  
oscillator modes. The user can program three configu-  
ration bits (FOSC2:FOSC0) to select one of these eight  
modes (modes 5-8 are new PIC16 oscillator  
configurations):  
C1  
C2  
LP  
XT  
32 kHz  
200 kHz  
200 kHz  
1 MHz  
33 pF  
15 pF  
56 pF  
15 pF  
15 pF  
15 pF  
15 pF  
15 pF  
33 pF  
15 pF  
56 pF  
15 pF  
15 pF  
15 pF  
15 pF  
15 pF  
1. LP  
2. XT  
3. HS  
4. RC  
Low-Power Crystal  
Crystal/Resonator  
4 MHz  
High-Speed Crystal/Resonator  
External Resistor/Capacitor with  
FOSC/4 output on RA6  
HS  
4 MHz  
8 MHz  
5. RCIO  
6. INTIO1  
7. INTIO2  
8. ECIO  
External Resistor/Capacitor with  
I/O on RA6  
20 MHz  
Capacitor values are for design guidance only.  
Internal Oscillator with FOSC/4  
output on RA6 and I/O on RA7  
These capacitors were tested with the crystals listed  
below for basic start-up and operation. These values  
were not optimized.  
Internal Oscillator with I/O on RA6  
and RA7  
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.  
External Clock with I/O on RA6  
4.2  
Crystal Oscillator/Ceramic  
Resonators  
See the notes following this table for additional  
information.  
In XT, LP or HS modes, a crystal or ceramic resonator  
is connected to the OSC1/CLKI and OSC2/CLKO pins  
to establish oscillation (see Figure 4-1 and Figure 4-2).  
The PIC16F818/819 oscillator design requires the use  
of a parallel cut crystal. Use of a series cut crystal may  
give a frequency out of the crystal manufacturer’s  
specifications.  
Note 1: Higher capacitance increases the stability  
of the oscillator but also increases the  
start-up time.  
2: Since each crystal has its own character-  
istics, the user should consult the crystal  
manufacturer for appropriate values of  
external components.  
FIGURE 4-1:  
CRYSTAL OPERATION  
(HS, XT OR LP OSC  
CONFIGURATION)  
3: RS may be required in HS mode, as well  
as XT mode, to avoid overdriving crystals  
with low drive level specification.  
OSC1  
PIC16F818/819  
C1(1)  
4: Always verify oscillator performance over  
the VDD and temperature range that is  
expected for the application.  
XTAL  
OSC2  
(3)  
RF  
Sleep  
(2)  
RS  
C2(1)  
To Internal  
Logic  
Note 1: See Table 4-1 for typical values of C1 and C2.  
2: A series resistor (RS) may be required for AT  
strip cut crystals.  
3: RF varies with the crystal chosen (typically  
between 2 Mto 10 MΩ).  
2004 Microchip Technology Inc.  
DS39598E-page 33