TC1784
General Purpose Timer Array (GPTA
®
v5)
User´s Manual
21-88
V1.1, 2011-05
GPTA
®
v5, V1.14
LTC03 and LTC04 are configured in Compare Mode. They are enabled if its SI inputs
are at high level and are responsible for the LTC04OUT signal generation in Phase 2.
With the programmed values from
, the LTC04OUT signal of Phase 2 has a
period of 2000
D
(= 7D0
H
) clocks of the LTC00IN clock signal and a duty cycle of 75%
(= 1500
D
or 5DC
H
).
LTC00 to LTC04 for the PWM example must be configured as defined in
Note: Special care has to be taken not to reprogrammed the group of local timer cells
(LTC) CAPCOM register before the previous global or local coherent update has
been completed (end of current local timer period). Therefore maximum only one
global coherent update within a timer period is possible! No Local coherent
updates may be activated while a global coherent update modifying the period has
not been completed.
Note: If several sequential coherent updates within a group of Local Timer Cells (LTC)
is required, instead of using the global coherent update feature, the local coherent
update mechanism (double action principle) is preferable. Mixing both principle, so
updating the period using the coherent update and updating one or more duty
cycle using local coherent update (double action principle) may result under
specific condition in distorted signals (new duty cycle, old period or old duty cycle
and new period). Therefore within a period either a global coherent update or
multiple local coherent updates may be scheduled.
Note: To generate an output signal having 0% duty cycle (continuously low), the duty
compare of the active cells must be set to FFFF
H
. The timer sets the data output
line by generating a respective signal on MO0 and MO1, but this signal is
overruled by the dominating duty compare cell resetting the same data output line
and therefore not passing the MI0 and MI1 signal from the timer to the data output
line. This result in a data output line remaining continuously low.
Note: To generate an output signal having 100% duty cycle (continuously high), the duty
cycle threshold must be set above the period threshold value. Therefore no reset
event for the data line is generated and periodically the timer generates a set
event. This result in a data output line remaining continuously high.
Содержание TC1784
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