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ATMEGA8L-8AUR 参数 Datasheet PDF下载

ATMEGA8L-8AUR图片预览
型号: ATMEGA8L-8AUR
PDF下载: 下载PDF文件 查看货源
内容描述: 8位爱特梅尔带有8K字节的系统内可编程闪存 [8-bit Atmel with 8KBytes In-System PRogrammable Flash]
分类和应用: 闪存
文件页数/大小: 331 页 / 6705 K
品牌: ATMEL [ ATMEL ]
 浏览型号ATMEGA8L-8AUR的Datasheet PDF文件第27页浏览型号ATMEGA8L-8AUR的Datasheet PDF文件第28页浏览型号ATMEGA8L-8AUR的Datasheet PDF文件第29页浏览型号ATMEGA8L-8AUR的Datasheet PDF文件第30页浏览型号ATMEGA8L-8AUR的Datasheet PDF文件第32页浏览型号ATMEGA8L-8AUR的Datasheet PDF文件第33页浏览型号ATMEGA8L-8AUR的Datasheet PDF文件第34页浏览型号ATMEGA8L-8AUR的Datasheet PDF文件第35页  
ATmega8(L)  
Oscillator Calibration  
Register – OSCCAL  
Bit  
7
6
5
4
3
2
1
0
CAL7  
R/W  
CAL6  
R/W  
CAL5  
R/W  
CAL4  
R/W  
CAL3  
R/W  
CAL2  
R/W  
CAL1  
R/W  
CAL0  
OSCCAL  
Read/Write  
Initial Value  
R/W  
Device Specific Calibration Value  
• Bits 7..0 – CAL7..0: Oscillator Calibration Value  
Writing the calibration byte to this address will trim the Internal Oscillator to remove process vari-  
ations from the Oscillator frequency. During Reset, the 1MHz calibration value which is located  
in the signature row High byte (address 0x00) is automatically loaded into the OSCCAL Regis-  
ter. If the internal RC is used at other frequencies, the calibration values must be loaded  
manually. This can be done by first reading the signature row by a programmer, and then store  
the calibration values in the Flash or EEPROM. Then the value can be read by software and  
loaded into the OSCCAL Register. When OSCCAL is zero, the lowest available frequency is  
chosen. Writing non-zero values to this register will increase the frequency of the Internal Oscil-  
lator. Writing 0xFF to the register gives the highest available frequency. The calibrated Oscillator  
is used to time EEPROM and Flash access. If EEPROM or Flash is written, do not calibrate to  
more than 10ꢀ above the nominal frequency. Otherwise, the EEPROM or Flash write may fail.  
Note that the Oscillator is intended for calibration to 1.0MHz, 2.0MHz, 4.0MHz, or 8.0MHz. Tun-  
ing to other values is not guaranteed, as indicated in Table 11.  
Table 11. Internal RC Oscillator Frequency Range  
Min Frequency in Percentage of  
Nominal Frequency (%)  
Max Frequency in Percentage of  
Nominal Frequency (%)  
OSCCAL Value  
0x00  
50  
75  
100  
150  
200  
0x7F  
0xFF  
100  
31  
2486AA–AVR–02/2013