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ATTINY13 Datasheet(PDF) 23 Page - ATMEL Corporation |
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ATTINY13 Datasheet(HTML) 23 Page - ATMEL Corporation |
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23 / 169 page  23 ATtiny13 2535B–AVR–01/04 write may fail. Note that the Oscillator is intended for calibration to 9.6 MHz or 4.8 MHz. Tuning to other values is not guaranteed, as indicated in Table 6. 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. External Clock To drive the device from an external clock source, CLKI should be driven as shown in Figure 12. To run the device on an external clock, the CKSEL Fuses must be pro- grammed to “00”. Figure 12. External Clock Drive Configuration When this clock source is selected, start-up times are determined by the SUT Fuses as shown in Table 7. When applying an external clock, it is required to avoid sudden changes in the applied clock frequency to ensure stable operation of the MCU. A variation in frequency of more than 2% from one clock cycle to the next can lead to unpredictable behavior. It is required to ensure that the MCU is kept in Reset during such changes in the clock frequency. Note that the System Clock Prescaler can be used to implement run-time changes of the internal clock frequency while still ensuring stable operation. Refer to “System Clock Prescaler” on page 24 for details. Table 6. 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 7. Start-up Times for the External Clock Selection SUT1..0 Start-up Time from Power- down and Power-save Additional Delay from Reset Recommended Usage 00 6 CK 14CK BOD enabled 01 6 CK 14CK + 4 ms Fast rising power 10 6 CK 14CK + 64 ms Slowly rising power 11 Reserved EXTERNAL CLOCK SIGNAL CLKI GND |
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