CHAPTER 29:Indicator PWM
1092
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G
3.
Operation of Indicator PWM
This section explains the operations of the indicator PWM timer.
Notes:
−
The explanations in this section assume that PWM output is normal polarity. When inverse
polarity is set, invert the PWM output polarity shown in this explanation.
−
For details on how to set inverse polarity, see the OSEL bit in 4.1 Timer Control Register
(ITMCR).
3.1.
Indicator PWM Timer
The indicator PWM timer starts counting down from the set cycle value upon software trigger activation.
The first output at that time is the L level. If the 16-bit down counter matches the set value in the duty
setting register, the output is inverted to the H level. Then, the output is inverted to the L level again when
the counter underflows. Thus, this timer can generate a waveform with an arbitrary cycle and duty. The
cycle of the output pulse can be controlled by configuring IPCSR register settings. The duty ratio can be
controlled by configuring IPDUT register settings.
Figure 3-1: Indicator PWM Operation Timing Chart
CTEN
m
n
0
(1)
(2)
PWM
Output
waveform
(1)
=
T
×
(n+1)ms
(2) =
T
×
(m+1)ms
T : Count clock period
m : Value in IPCSR
n : Value in IPDUT
DOP
STRG
A period of Bus clock
Содержание S6J3200 Series
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