TC1796
Peripheral Units (Vol. 2 of 2)
General Purpose Timer Array (GPTA)
User’s Manual 24-53 V2.0, 2007-07
GPTA, V2.0
value T. Thereafter, the observation switches to “After” and remains there until the timer
exits the observation window. This graphic can be related to Table 24-37 where the
comparator window equals the period, and the observation window is always centered
on the threshold T.
Figure 24-40 Graphical Representation of Signed Compare (Period = 2 × 2
k
)
The Figure 24-41 illustrates the Signed compare where the period may also be unequal
a multiple of 2. The graphical representation of this general case is analogous to the one
described in Figure 24-31.
If the period is not a multiple of 2, the graphical representation of the Signed compare
shows a discontinuity in the “Before” and “After” ranges. Indeed, the widths of the
“Before” and “After” windows are not constant, as they depend on the value T. As a
consequence, the observation window is not centered on T. The result is that the position
of the observation window would have to be re-evaluated for each value T (i.e.
determining the widths of the “After” and the “Before” window). For this calculation, the
principal characteristic is shown in Table 24-41 (2 × 2
k
- period = comparator window -
period).
MCT05949
Before
After
Timer
Mmm
Threshold
M
Value of T
After
Before
Observation Window
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