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ATMEGA8-16PU Scheda tecnica(PDF) 31 Page - ATMEL Corporation

Il numero della parte ATMEGA8-16PU
Spiegazioni elettronici  8-bit with 8K Bytes In-System Programmable Flash
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Produttore elettronici  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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ATMEGA8-16PU Scheda tecnica(HTML) 31 Page - ATMEL Corporation

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31
2486T–AVR–05/08
ATmega8(L)
Oscillator Calibration
Register – OSCCAL
• 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 1 MHz 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 10% above the nominal frequency. Otherwise, the EEPROM or Flash write may fail.
Note that the Oscillator is intended for calibration to 1.0, 2.0, 4.0, or 8.0 MHz. Tuning to other
values is not guaranteed, as indicated in Table 11.
Bit
765
4321
0
CAL7
CAL6
CAL5
CAL4
CAL3
CAL2
CAL1
CAL0
OSCCAL
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
Device Specific Calibration Value
Table 11. Internal RC Oscillator Frequency Range
OSCCAL Value
Min Frequency in Percentage of
Nominal Frequency (%)
Max Frequency in Percentage of
Nominal Frequency (%)
0x00
50
100
0x7F
75
150
0xFF
100
200


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