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AT90SCR100 Datasheet(PDF) 37 Page - ATMEL Corporation |
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AT90SCR100 Datasheet(HTML) 37 Page - ATMEL Corporation |
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37 / 433 page  37 TPR0327AY–SMS–30Jan09 AT90SCR100 Figure 7-4. Programming PLL 7.2.5 Internal RC Oscillator By default, the Internal RC Oscillator provides an approximate 8 MHz clock. Though voltage and temperature dependent, this clock can be very accurately calibrated by the user. See Table 31-2 on page 411 and “Internal RC Oscillator Speed” on page 38 for more details. This oscillator is used to time Eeprom and Flash write accesses. This is why its calibration is important. During reset, hardware loads the pre-programmed calibration value into the OSCCAL Register and thereby automatically calibrates the RC Oscillator. The accuracy of this calibration is shown as Factory calibration in Table 31-2 on page 411. By changing the OSCCAL register from SW, see “OSCCAL – Oscillator Calibration Register” on page 39, it is possible to get a higher calibration accuracy than by using the factory calibration. The accuracy of this calibration is shown as User calibration in Table 31-2 on page 411. Switch clk to clk PLLCR.PLLMUX = 1 MUX PLL Configure CPU Divider CLKPR = xxxxb Enable PLL PLLCR.ON = 1 No Yes Is PLL Locked ? PLLCR.LOCK = 1 ? PLL Programming |
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