TC1796
System Units (Vol. 1 of 2)
Clock System and Control
User’s Manual 3-7 V2.0, 2007-07
Clock, V2.0
3.2.1.3 Oscillator Gain Control
The oscillator starts with a high drive level (gain) during and after a power-on reset to
ensure safe start-up behavior in the beginning (force the crystal oscillation). When a
stable oscillation has been reached after oscillation start-up, the gain of the oscillator can
be reduced. This reduces the oscillator’s power consumption, which is especially
important in the power saving modes. This gain reduction is selected by
OSC_CON.OGC = 1.
Note: Oscillator measurement (margin or negative resistance and XTAL1 input
amplitude) for the oscillator crystal system must be executed also with reduced
gain.
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