27.4.4 Input Capture Mode
The input capture mode is selected when (CPWMS = 0), (MSnB:MSnA = 0:0), and
(ELSnB:ELSnA ≠ 0:0).
When a selected edge occurs on the channel input, the current value of the TPM counter
is captured into the CnV register, at the same time the CHnF bit is set and the channel
interrupt is generated if enabled by CHnIE = 1 (see the following figure).
When a channel is configured for input capture, the TPM_CHn pin is an edge-sensitive
input. ELSnB:ELSnA control bits determine which edge, falling or rising, triggers input-
capture event. Note that the maximum frequency for the channel input signal to be
detected correctly is counter clock divided by 4, which is required to meet Nyquist
criteria for signal sampling.
Writes to the CnV register are ignored in input capture mode.
channel (n) input
synchronizer
edge
detector
was falling
edge selected?
was rising
edge selected?
rising edge
falling edge
0
1
1
0
0
0
CnV
D
CLK
D
CLK
channel (n) interrupt
CHnIE
CHnF
timer module clock
timer module counter
Q
Q
Figure 27-5. Input capture mode
The CHnF bit is set on the third rising edge of the counter clock after a valid edge occurs
on the channel input.
27.4.5 Output Compare Mode
The output compare mode is selected when (CPWMS = 0), and (MSnB:MSnA = X:1).
Functional description
MKW01Z128 MCU Reference Manual, Rev. 3, 04/2016
532
Freescale Semiconductor, Inc.
Содержание MKW01Z128
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