Datenblatt-Suchmaschine für elektronische Bauteile |
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ATTINY2313-20PU Datenblatt(PDF) 27 Page - ATMEL Corporation |
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ATTINY2313-20PU Datenblatt(HTML) 27 Page - ATMEL Corporation |
27 / 231 page 27 ATtiny2313/V 2543I–AVR–04/06 Notes: 1. These options should only be used when not operating close to the maximum fre- quency of the device, and only if frequency stability at start-up is not important for the application. These options are not suitable for crystals. 2. These options are intended for use with ceramic resonators and will ensure fre- quency stability at start-up. They can also be used with crystals when not operating close to the maximum frequency of the device, and if frequency stability at start-up is not important for the application. Calibrated Internal RC Oscillator The calibrated internal RC Oscillator provides a fixed 8.0 MHz clock. The frequency is nominal value at 3V and 25 °C. If 8 MHz frequency exceeds the specification of the device (depends on V CC), the CKDIV8 Fuse must be programmed in order to divide the internal frequency by 8 during start-up. The device is shipped with the CKDIV8 Fuse programmed. This clock may be selected as the system clock by programming the CKSEL Fuses as shown in Table 6. If selected, it will operate with no external compo- nents. During reset, hardware loads the calibration byte into the OSCCAL Register and thereby automatically calibrates the RC Oscillator. At 3V and 25 °C, this calibration gives a frequency within ± 10% of the nominal frequency. Using calibration methods as described in application notes available at www.atmel.com/avr it is possible to achieve ± 2% 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 164. Note: 1. The device is shipped with this option selected. Table 5. Start-up Times for the Crystal Oscillator Clock Selection CKSEL0 SUT1..0 Start-up Time from Power-down and Power-save Additional Delay from Reset (VCC = 5.0V) Recommended Usage 0 00 258 CK(1) 14CK + 4.1 ms Ceramic resonator, fast rising power 0 01 258 CK(1) 14CK + 65 ms Ceramic resonator, slowly rising power 010 1K CK(2) 14CK Ceramic resonator, BOD enabled 011 1K CK(2) 14CK + 4.1 ms Ceramic resonator, fast rising power 100 1K CK(2) 14CK + 65 ms Ceramic resonator, slowly rising power 1 01 16K CK 14CK Crystal Oscillator, BOD enabled 1 10 16K CK 14CK + 4.1 ms Crystal Oscillator, fast rising power 1 11 16K CK 14CK + 65 ms Crystal Oscillator, slowly rising power Table 6. Internal Calibrated RC Oscillator Operating Modes CKSEL3..0 Nominal Frequency 0010 - 0011 4.0 MHz 0100 - 0101 8.0 MHz (1) |
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