ST STM32L4x6 Reference Manual page 827

RM0351
Bits 7:4 IC1F[3:0]: 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
0001: f
SAMPLING
0010: f
SAMPLING
0011: f
SAMPLING
0100: f
SAMPLING
0101: f
SAMPLING
0110: f
SAMPLING
0111: f
SAMPLING
1000: f
SAMPLING
1001: f
SAMPLING
1010: f
SAMPLING
1011: f
SAMPLING
1100: f
SAMPLING
1101: f
SAMPLING
1110: f
SAMPLING
1111: f
SAMPLING
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: CC1 channel is configured as input, IC1 is mapped on TI2
11: CC1 channel is configured as input, IC1 is mapped on TRC. This mode is working only if an
internal trigger input is selected through TS bit (TIMx_SMCR register)
Note: CC1S bits are writable only when the channel is OFF (CC1E = '0' in TIMx_CCER).
DTS
=f , N=2
CK_INT
=f , N=4
CK_INT
=f , N=8
CK_INT
=f /2, N=6
DTS
=f /2, N=8
DTS
=f /4, N=6
DTS
=f /4, N=8
DTS
=f /8, N=6
DTS
=f /8, N=8
DTS
=f /16, N=5
DTS
=f /16, N=6
DTS
=f /16, N=8
DTS
=f /32, N=5
DTS
=f /32, N=6
DTS
=f /32, N=8
DTS
DocID024597 Rev 3
Advanced-control timers (TIM1/TIM8)
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