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AT90SCR100 bảng dữ liệu(PDF) 37 Page - ATMEL Corporation

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AT90SCR100 bảng dữ liệu(HTML) 37 Page - ATMEL Corporation

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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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