4 5 6 0 1 2 3 4 5 6 0 1 2 3 4 5 6 0 1 2 3 4 5 6 0 1
channel (n) output
FTM counter
accumulator
0x1E
0x01
overflow
0x04
3
2
channels (n) and (n+1) are in
Combine Mode with high-true pulses
and Complementary
channel (n) ELSB:ELSA = 2'b10
CNTIN = 0x0000
MOD = 0x0006
C(n)V = 0x0002
channel (n) FRACVAL = 0x00
C(n+1)V = 0x0004
channel (n+1) FRACVAL = 0x03
T is the period of one unit of FTM counter
3
2
1
Combine duty cycle DC1 =
(C(n)V - C(n+1)V) x T =
0x0002 x T
4 5 6 0 1 2 3 4 5 6 0 1 2 3
dithering
(one unit of
FTM counter)
0x07
0x0A
channel (n+1) output
0x0D
0x10
Combine duty cycle DC2 =
(C(n)V - C(n+1)V + 0x0001) x T =
0x0003 x T
Combine duty cycle DC1 =
(C(n)V - C(n+1)V) x T =
0x0002 x T
Combine duty cycle DC1 =
(C(n)V - C(n+1)V) x T =
0x0002 x T
Combine duty cycle DC1 =
(C(n)V - C(n+1)V) x T =
0x0002 x T
Combine duty cycle DC1 =
(C(n)V - C(n+1)V) x T =
0x0002 x T
Figure 41-109. Channel (n+1) Match Edge Dithering in Combine Mode
NOTE
It is recommended to use only one PWM Edge Dithering
(channel (n) PWM Edge Dithering or channel (n+1) PWM
Edge Dithering) at a time.
For the generation of 0% PWM in the channel (n) (with channel
(n) ELSB:ELSA = 2'b10) using Combine mode and PWM Edge
Dithering, it is recommended to use:
• (C(n)V < CNTIN or C(n)V > MOD) and (channel (n)
FRACVAL is zero) and
• (channel (n+1) FRACVAL is zero).
For the generation of 100% PWM in the channel (n) (with
channel (n) ELSB:ELSA = 2'b10) using Combine mode and
PWM Edge Dithering, it is recommended to use:
• (C(n)V = CNTIN) and (channel (n) FRACVAL is zero) and
• (C(n+1)V < CNTIN or C(n+1)V > MOD) and (channel (n
+1) FRACVAL is zero).
41.6 Reset overview
The FTM is reset whenever any chip reset occurs.
When the FTM exits from reset:
Chapter 41 FlexTimer Module (FTM)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
1113
Содержание KE1xF Series
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