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TC1784
General Purpose Timer Array (GPTA
®
v5)
User´s Manual
21-82
V1.1, 2011-05
GPTA
®
v5, V1.14
Figure 21-57 Pulse Count Modulation Example 1
shows the rounding behavior for a period of 100 clocks.
The output is OFF for the remaining cycles of the period. The worst case error is
approxi2/-1 ON pulses. A subtraction performed via software may be used to
reduce the worst case error.
If the duty cycle is changed at an arbitrary time, the actual duty cycle for the entire current
period will reflect the old duty cycle, the new one, or a mixture of both.
Table 21-5
Implicit PCM Rounding
Desired Duty Cycle
Expected ON Pulses
Actual ON Pulses
0.000 = 0000
0
0
0.100 = 199A
H
10
11
0.500 = 8000
H
50
50
0.800 = CCCD
H
80
82
0.900 = E666
H
90
90
0.999 = FFBE
H
100
99
1.000 = FFFF
H
100
100
MCT05964
0000
H
0000
H
Timer Value
Normal/
Reversed
0001
H
8000
H
0002
H
4000
H
0003
H
C000
H
0004
H
2000
H
FFFF
H
FFFF
H
Desired
Duty Cycle
0.25 = 4000
H
0.00 = 0000
H
0.50 = 8000
H
0.75 = C000
H
1.00 = FFFF
H
Содержание TC1784
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