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ATMEGA8-16AC Datasheet(PDF) 28 Page - ATMEL Corporation |
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ATMEGA8-16AC Datasheet(HTML) 28 Page - ATMEL Corporation |
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28 / 303 page  28 ATmega8(L) 2486M–AVR–12/03 Calibrated Internal RC Oscillator The calibrated internal RC Oscillator provides a fixed 1.0, 2.0, 4.0, or 8.0 MHz clock. All frequencies are nominal values at 5V and 25 °C. This clock may be selected as the sys- tem clock by programming the CKSEL Fuses as shown in Table 9. If selected, it will operate with no external components. The CKOPT Fuse should always be unpro- grammed when using this clock option. During reset, hardware loads the calibration byte into the OSCCAL Register and thereby automatically calibrates the RC Oscillator. At 5V, 25 °C and 1.0 MHz Oscillator frequency selected, this calibration gives a frequency within ± 3% of the nominal frequency. Using run-time calibration methods as described in application notes available at www.atmel.com/avr it is possible to achieve ± 1% accu- racy at any given V CC and Temperature. When this Oscillator is used as the chip clock, the Watchdog Oscillator will still be used for the Watchdog Timer and for the Reset Time-out. For more information on the pre-programmed calibration value, see the sec- tion “Calibration Byte” on page 221. Note: 1. The device is shipped with this option selected. When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in Table 10. PB6 (XTAL1/TOSC1) and PB7(XTAL2/TOSC2) can be used as either general I/O pins or Timer Oscillator pins.. Note: 1. The device is shipped with this option selected. Table 9. Internal Calibrated RC Oscillator Operating Modes CKSEL3..0 Nominal Frequency (MHz) 0001(1) 1.0 0010 2.0 0011 4.0 0100 8.0 Table 10. Start-up Times for the Internal Calibrated RC Oscillator Clock Selection SUT1..0 Start-up Time from Power-down and Power-save Additional Delay from Reset (VCC = 5.0V) Recommended Usage 00 6 CK – BOD enabled 01 6 CK 4.1 ms Fast rising power 10(1) 6 CK 65 ms Slowly rising power 11 Reserved |
Similar Part No. - ATMEGA8-16AC |
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Similar Description - ATMEGA8-16AC |
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