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ATmega16-16PU Folha de dados(PDF) 28 Page - ATMEL Corporation |
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ATmega16-16PU Folha de dados(HTML) 28 Page - ATMEL Corporation |
28 / 357 page 28 2466S–AVR–05/09 ATmega16(L) Low-frequency Crystal Oscillator To use a 32.768 kHz watch crystal as the clock source for the device, the Low-frequency Crystal Oscillator must be selected by setting the CKSEL Fuses to “1001”. The crystal should be con- nected as shown in Figure 12. By programming the CKOPT Fuse, the user can enable internal capacitors on XTAL1 and XTAL2, thereby removing the need for external capacitors. The inter- nal capacitors have a nominal value of 36 pF. When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in Table 6. Note: 1. These options should only be used if frequency stability at start-up is not important for the application. External RC Oscillator For timing insensitive applications, the external RC configuration shown in Figure 13 can be used. The frequency is roughly estimated by the equation f = 1/(3RC). C should be at least 22 pF. By programming the CKOPT Fuse, the user can enable an internal 36 pF capacitor between XTAL1 and GND, thereby removing the need for an external capacitor. For more information on Oscillator operation and details on how to choose R and C, refer to the External RC Oscillator application note. Figure 13. External RC Configuration The Oscillator can operate in four different modes, each optimized for a specific frequency range. The operating mode is selected by the fuses CKSEL3..0 as shown in Table 7. Table 6. Start-up Times for the Low-frequency Crystal Oscillator Clock Selection SUT1..0 Start-up Time from Power-down and Power-save Additional Delay from Reset (V CC = 5.0V) Recommended Usage 00 1K CK(1) 4.1 ms Fast rising power or BOD enabled 01 1K CK(1) 65 ms Slowly rising power 10 32K CK 65 ms Stable frequency at start-up 11 Reserved Table 7. External RC Oscillator Operating Modes CKSEL3..0 Frequency Range (MHz) 0101 0.1 ≤ 0.9 0110 0.9 - 3.0 0111 3.0 - 8.0 1000 8.0 - 12.0 XTAL2 XTAL1 GND C R VCC NC |
Nº de peça semelhante - ATmega16-16PU |
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Descrição semelhante - ATmega16-16PU |
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