Table 41-248. Clear CHnF Bit when DMA = 1
CHnIE
How CHnF Bit Can Be Cleared
0
CHnF bit is cleared either when the channel DMA transfer is done or by reading CnSC while CHnF is set and
then writing a 0 to CHnF bit.
1
CHnF bit is cleared when the channel DMA transfer is done.
41.4.24 Dual Edge Capture Mode
The dual edge capture mode is selected if FTMEN = 1 and DECAPEN = 1. This mode
allows to measure a pulse width or period of the signal on the input of channel (n) of a
channel pair. The channel (n) filter can be active in this mode when n is 0 or 2.
channel (n) input
system clock
synchronizer
Filter*
Dual edge capture
mode logic
is filter
enabled?
FTM counter
* Filtering function for dual edge capture mode is only available in the channels 0 and 2
channel (n)
interrupt
channel (n+1)
interrupt
C(n+1)V[15:0]
C(n)V[15:0]
CH(n+1)IE
CH(n+1)F
CH(n)IE
CH(n)F
FTMEN
DECAPEN
DECAP
MS(n)A
ELS(n)B:ELS(n)A
ELS(n+1)B:ELS(n+1)A
CLK
CLK
D
Q
D
Q
0
1
Figure 41-244. Dual Edge Capture Mode Block Diagram
The MS(n)A bit defines if the dual edge capture mode is one-shot or continuous.
The ELS(n)B:ELS(n)A bits select the edge that is captured by channel (n), and ELS(n
+1)B:ELS(n+1)A bits select the edge that is captured by channel (n+1). If both
ELS(n)B:ELS(n)A and ELS(n+1)B:ELS(n+1)A bits select the same edge, then it is the
period measurement. If these bits select different edges, then it is a pulse width
measurement.
In the dual edge capture mode, only channel (n) input is used and channel (n+1) input is
ignored.
If the selected edge by channel (n) bits is detected at channel (n) input, then CH(n)F bit is
set and the channel (n) interrupt is generated (if CH(n)IE = 1). If the selected edge by
channel (n+1) bits is detected at channel (n) input and (CH(n)F = 1), then CH(n+1)F bit is
set and the channel (n+1) interrupt is generated (if CH(n+1)IE = 1).
Functional Description
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
1072
Freescale Semiconductor, Inc.
Содержание K53 Series
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