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ATMEGA169V Folha de dados(PDF) 28 Page - ATMEL Corporation |
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ATMEGA169V Folha de dados(HTML) 28 Page - ATMEL Corporation |
28 / 365 page 28 ATmega169/V 2514P–AVR–07/06 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 MHz. Tuning to other values is not guaranteed, as indicated in Table 10. External Clock To drive the device from an external clock source, XTAL1 should be driven as shown in Figure 13. To run the device on an external clock, the CKSEL Fuses must be pro- grammed to “0000”. Figure 13. External Clock Drive Configuration When this clock source is selected, start-up times are determined by the SUT Fuses as shown in Table 12. 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 10. 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% Table 11. Crystal Oscillator Clock Frequency CKSEL3..0 Frequency Range 0000 0 - 16 MHz NC EXTERNAL CLOCK SIGNAL XTAL2 XTAL1 GND |
Nº de peça semelhante - ATMEGA169V |
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Descrição semelhante - ATMEGA169V |
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