ST STM32G473 User Manual

General-purpose timers (TIM15/TIM16/TIM17) RM0440
1426/2126 RM0440 Rev 4
30.8.6 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 input capture mode (this section) or for output compare
mode (next 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 for input capture and for
output compare modes. It is possible to combine both modes independently (e.g. channel 1
in input capture mode and channel 2 in output compare mode).
Input capture mode
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
1514131211109876543210
Res. Res. Res. Res. Res. Res. Res. Res. IC1F[3:0] IC1PSC[1:0] CC1S[1:0]
rw rw rw rw rw rw rw rw
Bits 31:8 Reserved, must be kept at reset value.
Bits 7:4 IC1F[3:0]: Input capture 1 filter
This bit-field defines the frequency used to sample tim_ti1 input and the length of the digital
filter applied to tim_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
0001: f
SAMPLING
=f
tim_ker_ck
, N=2
0010: f
SAMPLING
=f
tim_ker_ck
, N=4
0011: f
SAMPLING
=f
tim_ker_ck
, N=8
0100: f
SAMPLING
=f
DTS
/2, N=
0101: f
SAMPLING
=f
DTS
/2, N=8
0110: f
SAMPLING
=f
DTS
/4, N=6
0111: f
SAMPLING
=f
DTS
/4, N=8
1000: f
SAMPLING
=f
DTS
/8, N=6
1001: f
SAMPLING
=f
DTS
/8, N=8
1010: f
SAMPLING
=f
DTS
/16, N=5
1011: f
SAMPLING
=f
DTS
/16, N=6
1100: f
SAMPLING
=f
DTS
/16, N=8
1101: f
SAMPLING
=f
DTS
/32, N=5
1110: f
SAMPLING
=f
DTS
/32, N=6
1111: f
SAMPLING
=f
DTS
/32, N=8
Bits 3:2 IC1PSC[1:0]: Input capture 1 prescaler
This bit-field defines the ratio of the prescaler acting on CC1 input (tim_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

ST STM32G473 Specifications

General

Brand	ST
Model	STM32G473
Category	Microcontrollers
Language	English