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ATMEGA32-16MC Datasheet(PDF) 29 Page - ATMEL Corporation |
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ATMEGA32-16MC Datasheet(HTML) 29 Page - ATMEL Corporation |
29 / 347 page 29 ATmega32(L) 2503J–AVR–10/06 When this Oscillator is selected, start-up times are determined by the SUT fuses as shown in Table 8. Note: 1. This option should not be used when operating close to the maximum frequency of the device. 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 for the 1MHz 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 calibration methods as described in application notes available at www.atmel.com/avr it is possible to achieve ± 1% accuracy 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 section “Calibration Byte” on page 258. Note: 1. The device is shipped with this option selected. Table 7. External RC Oscillator Operating Modes CKSEL3..0 Frequency Range (MHz) 0101 0.1 - 0.9 0110 0.9 - 3.0 0111 3.0 - 8.0 1000 8.0 - 12.0 Table 8. Start-up Times for the External 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 18 CK – BOD enabled 01 18 CK 4.1 ms Fast rising power 10 18 CK 65 ms Slowly rising power 11 6 CK(1) 4.1 ms Fast rising power or BOD enabled 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 |
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