TC1796
Peripheral Units (Vol. 2 of 2)
General Purpose Timer Array (GPTA)
User’s Manual 24-41 V2.0, 2007-07
GPTA, V2.0
programmed and then the window is split into two windows, the “After” window and the
“Before” window (Figure 24-28). If the timer lies in the “After” window at the time of
programming the threshold, the event is performed immediately. If it lies in the “Before”
window, the event will happen later when the timer reaches the threshold T. The “Before”
window refers to a “prediction range”, and the “After” window refers to the “history buffer”.
From a practical point of view, once the value T is determined, it is necessary to calculate
the observation window (position and width). Before updating the value T, the application
must ensure that the observation window was entered but has not yet been left.
The width of the observation window cannot exceed the timer period. To support
reloaded counters where the overflow can occur within the observation window, a
signed comparison is performed.
Figure 24-28 Before and After Windows
MCT05937
T
Observation Window
Before After
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