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ATmega64A 数据表(PDF) 45 Page - ATMEL Corporation |
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ATmega64A 数据表(HTML) 45 Page - ATMEL Corporation |
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45 / 392 page  45 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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