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ATMEGA2560-16AU-SL383 参数 Datasheet PDF下载

ATMEGA2560-16AU-SL383图片预览
型号: ATMEGA2560-16AU-SL383
PDF下载: 下载PDF文件 查看货源
内容描述: [Microcontroller, 8-Bit, FLASH, AVR RISC CPU, 16MHz, CMOS, PQFP100, 14 X 14 MM, 1 MM HEIGHT, 0.50 MM PITCH, GREEN, PLASTIC, MS-026AED, TQFP-100]
分类和应用: 时钟微控制器
文件页数/大小: 448 页 / 7518 K
品牌: ATMEL [ ATMEL ]
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C1 and C2 should always be equal for both crystals and resonators. The optimal value of the  
capacitors depends on the crystal or resonator in use, the amount of stray capacitance, and the  
electromagnetic noise of the environment. Some initial guidelines for choosing capacitors for  
use with crystals are given in Table 10-3. For ceramic resonators, the capacitor values given by  
the manufacturer should be used.  
Figure 10-2. Crystal Oscillator Connections  
C2  
XTAL2  
C1  
XTAL1  
GND  
The Low Power Oscillator can operate in three different modes, each optimized for a specific fre-  
quency range. The operating mode is selected by the fuses CKSEL3:1 as shown in Table 10-3.  
Table 10-3. Low Power Crystal Oscillator Operating Modes(3)  
Recommended Range for Capacitors C1  
Frequency Range (MHz)  
0.4 - 0.9  
CKSEL3:1(1)  
100(2)  
101  
and C2 (pF)  
0.9 - 3.0  
12 - 22  
12 - 22  
12 - 22  
3.0 - 8.0  
110  
8.0 - 16.0(4)  
111  
Notes: 1. This is the recommended CKSEL settings for the different frequency ranges.  
2. This option should not be used with crystals, only with ceramic resonators.  
3. If 8 MHz frequency exceeds the specification of the device (depends on VCC), the CKDIV8  
Fuse can be programmed in order to divide the internal frequency by 8. It must be ensured  
that the resulting divided clock meets the frequency specification of the device.  
4. Max frequency when using ceramic oscillator is 10 MHz.  
The CKSEL0 Fuse together with the SUT1:0 Fuses select the start-up times as shown in Table  
10-4.  
Table 10-4. Start-up Times for the Low Power Crystal Oscillator Clock Selection  
Start-up Time from  
Power-down and  
Power-save  
Additional Delay  
from Reset  
Oscillator Source /  
Power Conditions  
(VCC = 5.0V)  
CKSEL0  
SUT1:0  
Ceramic resonator, fast  
rising power  
258 CK  
258 CK  
1K CK  
14CK + 4.1 ms(1)  
14CK + 65 ms(1)  
14CK(2)  
0
00  
Ceramic resonator, slowly  
rising power  
0
0
01  
10  
Ceramic resonator, BOD  
enabled  
42  
ATmega640/1280/1281/2560/2561  
2549L–AVR–08/07  
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