ST STM32L4x6 User Manual

General-purpose timers (TIM15/16/17) RM0351
976/1693 DocID024597 Rev 3
28.5.8 TIM15 capture/compare enable register (TIM15_CCER)
Address offset: 0x20
Reset value: 0x0000
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
DTS
0001: f
SAMPLING
=f
CK_INT
, N=2
0010: f
SAMPLING
=f
CK_INT
, N=4
0011: f
SAMPLING
=f
CK_INT
, N=8
0100: f
SAMPLING
=f
DTS
/2, N=6
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: 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).
1514131211109876543210
Res Res Res Res Res Res Res Res CC2NP Res CC2P CC2E CC1NP CC1NE CC1P CC1E
rw rw rw rw rw rw rw
Bits 15:8 Reserved, must be kept at reset value.
Bit 7 CC2NP: Capture/Compare 2 complementary output polarity
Refer to CC1NP description
Bit 6 Reserved, must be kept at reset value.

ST STM32L4x6 Specifications

General

Brand	ST
Model	STM32L4x6
Category	Microcontrollers
Language	English