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ATTINY2313-20PU Scheda tecnica(PDF) 28 Page - ATMEL Corporation |
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ATTINY2313-20PU Scheda tecnica(HTML) 28 Page - ATMEL Corporation |
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28 / 231 page  28 ATtiny2313/V 2543I–AVR–04/06 When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in Table 7. Note: 1. The device is shipped with this option selected. Oscillator Calibration Register – OSCCAL • Bits 6..0 – CAL6..0: Oscillator Calibration Value Writing the calibration byte to this address will trim the internal Oscillator to remove pro- cess variations from the Oscillator frequency. This is done automatically during Chip Reset. When OSCCAL is zero, the lowest available frequency is chosen. Writing non- zero values to this register will increase the frequency of the internal Oscillator. Writing 0x7F 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 cali- brate 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 8.0/4.0 MHz. Tuning to other values is not guaranteed, as indicated in Table 8. Avoid changing the calibration value in large steps when calibrating the Calibrated Inter- nal RC Oscillator to ensure stable operation of the MCU. A variation in frequency of more than 2% from one cycle to the next can lead to unpredictable behavior. Changes in OSCCAL should not exceed 0x20 for each calibration. Table 7. 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 14CK BOD enabled 01 6 CK 14CK + 4.1 ms Fast rising power 10(1) 6 CK 14CK + 65 ms Slowly rising power 11 Reserved Bit 7654 321 0 – CAL6 CAL5 CAL4 CAL3 CAL2 CAL1 CAL0 OSCCAL Read/Write R R/W R/W R/W R/W R/W R/W R/W Initial Value Device Specific Calibration Value Table 8. Internal RC Oscillator Frequency Range. OSCCAL Value Min Frequency in Percentage of Nominal Frequency Max Frequency in Percentage of Nominal Frequency 0x00 50% 100% 0x3F 75% 150% 0x7F 100% 200% |
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