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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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ATmega64A bảng dữ liệu(PDF) 43 Page - ATMEL Corporation |
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ATmega64A bảng dữ liệu(HTML) 43 Page - ATMEL Corporation |
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43 / 392 page  43 8160C–AVR–07/09 ATmega64A Figure 8-5. External Clock Drive Configuration When this clock source is selected, start-up times are determined by the SUT Fuses as shown in Table 8-9. 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. 8.9 Timer/Counter Oscillator For AVR microcontrollers with Timer/Counter Oscillator pins (TOSC1 and TOSC2), the crystal is connected directly between the pins. No external capacitors are needed. The Oscillator is opti- mized for use with a 32.768 kHz watch crystal. Applying an external clock source to TOSC1 is not recommended. Note: The Timer/Counter Oscillator uses the same type of crystal oscillator as Low-Frequency Oscillator and the internal capacitors have the same nominal value of 36 pF. Table 8-9. Start-up Times for the External 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 – BOD enabled 01 6 CK 4.1 ms Fast rising power 10 6 CK 65 ms Slowly rising power 11 Reserved EXTERNAL CLOCK SIGNAL |
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