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ATmega64A データシート(PDF) 45 Page - ATMEL Corporation

部品番号 ATmega64A
部品情報  8-bit Microcontroller with 64K Bytes In-System Programmable Flash
PDF  392 Pages
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メーカー  ATMEL [ATMEL Corporation]
ホームページ  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega64A データシート(HTML) 45 Page - ATMEL Corporation

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8160C–AVR–07/09
ATmega64A
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 8-10.
Table 8-10.
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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