RM0401 Rev 3 431/771
RM0401 General-purpose timers (TIM9 and TIM11)
436
Input capture mode
Bits 15:8 Reserved, must be kept at reset value.
Bits 7:4 IC1F: Input capture 1 filter
This bit-field defines the frequency used to sample TI1 input and the length of the digital filter
applied to TI1. The digital filter is made of an event counter in which N consecutive events
are needed to validate a transition on the output:
0000: No filter, sampling is done at f
DTS
1000: f
SAMPLING
=f
DTS
/8, N=6
0001: f
SAMPLING
=f
CK_INT
, N=21001: f
SAMPLING
=f
DTS
/8, N=8
0010: f
SAMPLING
=f
CK_INT
, N=41010: f
SAMPLING
=f
DTS
/16, N=5
0011: f
SAMPLING
=f
CK_INT
, N=81011: f
SAMPLING
=f
DTS
/16, N=6
0100: f
SAMPLING
=f
DTS
/2, N=61100: f
SAMPLING
=f
DTS
/16, N=8
0101: f
SAMPLING
=f
DTS
/2, N=81101: f
SAMPLING
=f
DTS
/32, N=5
0110: f
SAMPLING
=f
DTS
/4, N=61110: f
SAMPLING
=f
DTS
/32, N=6
0111: f
SAMPLING
=f
DTS
/4, N=81111: f
SAMPLING
=f
DTS
/32, N=8
Bits 3:2 IC1PSC: Input capture 1 prescaler
This bit-field defines the ratio of the prescaler acting on CC1 input (IC1).
The prescaler is reset as soon as CC1E=’0’ (TIMx_CCER register).
00: no prescaler, capture is done each time an edge is detected on the capture input
01: capture is done once every 2 events
10: capture is done once every 4 events
11: capture is done once every 8 events
Bits 1:0 CC1S: Capture/Compare 1 selection
This bit-field defines the direction of the channel (input/output) as well as the used input.
00: CC1 channel is configured as output
01: CC1 channel is configured as input, IC1 is mapped on TI1
10: Reserved
11: Reserved
Note: CC1S bits are writable only when the channel is OFF (CC1E = 0 in TIMx_CCER).
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