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ATMEGA128-16MU Datasheet(PDF) 41 Page - ATMEL Corporation |
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ATMEGA128-16MU Datasheet(HTML) 41 Page - ATMEL Corporation |
41 / 386 page 41 2467R–AVR–06/08 ATmega128 External RC Oscillator For timing insensitive applications, the External RC configuration shown in Figure 20 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 20. 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 11. When this Oscillator is selected, start-up times are determined by the SUT fuses as shown in Table 12. Note: 1. This option should not be used when operating close to the maximum frequency of the device. Table 11. 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 Table 12. Start-Up Times for the External RC Oscillator Clock Selection SUT1..0 Start-up Time from Power-down and Power-save Additional Delay from Reset (VCC = 5.0V) Recommended Usage 00 18 CK – BOD enabled 01 18 CK 4.1 ms Fast rising power 10 18 CK 65 ms Slowly rising power 11 6 CK(1) 4.1 ms Fast rising power or BOD enabled XTAL2 XTAL1 GND C R VCC NC |
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