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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega169P датащи(PDF) 36 Page - ATMEL Corporation |
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ATmega169P датащи(HTML) 36 Page - ATMEL Corporation |
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36 / 393 page  36 8018N–AVR–08/09 ATmega169P 8.7 External Clock To drive the device from an external clock source, XTAL1 should be driven as shown in Figure 8-3. To run the device on an external clock, the CKSEL Fuses must be programmed to “0000”. Figure 8-3. External Clock Drive Configuration When this clock source is selected, start-up times are determined by the SUT Fuses as shown in Table 8-11. When applying an external clock, it is required to avoid sudden changes in the applied clock fre- quency 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 37 for details. Table 8-10. Crystal Oscillator Clock Frequency CKSEL3..0 Frequency Range 0000 0 - 16 MHz Table 8-11. Start-up Times for the External Clock Selection SUT1..0 Start-up Time from Power- down and Power-save Additional Delay from Reset (V CC = 5.0V) Recommended Usage 00 6 CK 14CK BOD enabled 01 6 CK 14CK + 4.1 ms Fast rising power 10 6 CK 14CK + 65 ms Slowly rising power 11 Reserved NC EXTERNAL CLOCK SIGNAL XTAL2 XTAL1 GND |
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