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Advanced-control timers (TIM1&TIM8)
RM0008
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).
Input capture mode
Bits 15:12 IC2F : Input capture 2 filter
Bits 11:10 IC2PSC[1:0] : Input capture 2 prescaler
Bits 9:8 CC2S : Capture/Compare 2 selection
This bit-field defines the direction of the channel (input/output) as well as the used input.
00: CC2 channel is configured as output.
01: CC2 channel is configured as input, IC2 is mapped on TI2.
10: CC2 channel is configured as input, IC2 is mapped on TI1.
11: CC2 channel is configured as input, IC2 is mapped on TRC. This mode is working only if an
internal trigger input is selected through TS bit (TIMx_SMCR register)
Note: CC2S bits are writable only when the channel is OFF (CC2E = ‘0’ in TIMx_CCER).
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 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.
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Doc ID 13902 Rev 9
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