ARTERY AT32F421C8T7 - TMR Input Function; Figure 14-43 Overflow Event When PRBEN=0; Figure 14-44 Overflow Event When PRBEN=1; Figure 14-45 Input;Output Channel 1 Main Circuit

AT32F421 Series Reference Manual
2022.11.11 Page 205 Rev 2.02
Figure 14-43 Overflow event when PRBEN=0
0 1 2 3
...
31 32 0 1 2 3
...
31 32 0 1 2 3
COUNTER
31 32 0 1
32
...
PR[15:0]
OVFIF
TMR_CLK
0DIV[15:0]
22
Clear Clear Clear
Figure 14-44 Overflow event when PRBEN=1
0 1 2 3
...
21 22 0 1 2 3
...
31 32 0 1 2 3
COUNTER
31 32 0 1
32
...
PR[15:0]
OVFIF
TMR_CLK
0DIV[15:0]
22
Clear Clear Clear
14.3.3.3 TMR input function
The TMR14 timer has one independent channel that can be configured as input or output. As input, each
channel input signal is processed as below:
– TMRx_CHx outputs the pre-processed CxIRAW. Set the C1INSEL bit to select TMRx_CHx as the
source of CxIRAW.
– CxIRAW inputs the digital filter and then outputs a filtered signal CxIF. Set the sampling frequency
and sampling times of digital filter by setting the CxDF bit.
– CxIF inputs the edge detector and then outputs the signal CxIFPx after edge selection. The edge
selection is controlled by CxP and CxCP bits, and can be selected as rising edge, falling edge or
both edges active.
– CxIFPx inputs the capture signal selector and then outputs the signal CxIN after selection. The
capture signal selector is controlled by the CxC bits. The source of CxIN can be set as CxIFPx. The
CyIFPx (x≠y) is the CyIFPy from channel y and handled by channel x edge detector (for example,
the C1IFP2 is the C1IFP1 from channel 1 and then handled by channel 2 edge detector).
– CxIN outputs the signal CxIPS through the input channel divider. The division factor is set to “no
division”, “divided by 2”, “divided by 4” or “divided by 8” by setting the CxIDIV bit.
Figure 14-45 Input/output channel 1 main circuit
CaptureCNT counter C1DT
Compare
C1DT preload
0
1
C1OBEN
C1DT_shadow
C1OCTRL
Overflow event
C1ORAW
C1EN
1
0
disable
filter
Capture trigger
C1Ppolarity select
to GPIO
C1OUT
C1P/C1CP
edge detector
C1IN
TMRx_CH1
C1IRAW
C1DF
C1IFP1
C2IFP1
STCI
C1C
C1IDIV
input divider
C1EN