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ATMEGA8515 Datasheet(PDF) 40 Page - ATMEL Corporation |
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ATMEGA8515 Datasheet(HTML) 40 Page - ATMEL Corporation |
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40 / 257 page  40 ATmega8515(L) 2512K–AVR–01/10 will increase the frequency of the internal Oscillator. Writing $FF 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 14. External Clock To drive the device from an external clock source, XTAL1 should be driven as shown in Figure 21. To run the device on an external clock, the CKSEL Fuses must be pro- grammed to “0000”. By programming the CKOPT Fuse, the user can enable an internal 36 pF capacitor between XTAL1 and GND. Figure 21. External Clock Drive Configuration When this clock source is selected, start-up times are determined by the SUT Fuses as shown in Table 15. When applying an external clock, it is required to avoid sudden changes in the applied clock frequency to ensure stable operation of the MCU. A variation in frequency of more than 2% from one clock cycle to the next can lead to unpredictable behavior. It is required to ensure that the MCU is kept in Reset during such changes in the clock frequency. Table 14. Internal RC Oscillator Frequency Range. OSCCAL Value Min Frequency in Percentage of Nominal Frequency Max Frequency in Percentage of Nominal Frequency $00 50% 100% $7F 75% 150% $FF 100% 200% Table 15. Start-up Times for the External Clock Selection SUT1..0 Start-up Time from Power-down Additional Delay from Reset (VCC = 5.0V) Recommended Usage 00 6 CK – BOD enabled 01 6 CK 4.1 ms Fast rising power 10 6 CK 65 ms Slowly rising power 11 Reserved EXTERNAL CLOCK SIGNAL |
Similar Part No. - ATMEGA8515_10 |
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Similar Description - ATMEGA8515_10 |
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