ST STM32WL55JC Reference Manual page 928

General-purpose timers (TIM16/TIM17)
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
0010: f
0011: f
0100: f
0101: f
0110: f
0111: f
1000: f
1001: f
1010: f
1011: f
1100: f
1101: f
1110: f
1111: f
Bits 3:2 IC1PSC[1:0]: 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[1:0]: 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
Others: Reserved
Note: CC1S bits are writable only when the channel is OFF (CC1E = '0' in TIMx_CCER).
27.4.7 TIMx capture/compare mode register 1 [alternate] (TIMx_CCMR1)
(x = 16 to 17)
Address offset: 0x18
Reset value: 0x0000 0000
The same register can be used for output compare mode (this section) or for input capture
mode (previous section). The direction of a channel is defined by configuring the
corresponding CCxS bits. All the other bits of this register have a different function in input
and in output mode.
Output compare mode:
928/1454
=f , N=2
SAMPLING CK_INT
=f , N=4
SAMPLING CK_INT
=f , N=8
SAMPLING CK_INT
=f /2, N=
SAMPLING DTS
=f /2, N=8
SAMPLING DTS
=f /4, N=6
SAMPLING DTS
=f /4, N=8
SAMPLING DTS
=f /8, N=6
SAMPLING DTS
=f /8, N=8
SAMPLING DTS
=f /16, N=5
SAMPLING DTS
=f /16, N=6
SAMPLING DTS
=f /16, N=8
SAMPLING DTS
=f /32, N=5
SAMPLING DTS
=f /32, N=6
SAMPLING DTS
=f /32, N=8
SAMPLING DTS
RM0453 Rev 2
DTS
RM0453