RM0312 datasheet(152/275 Pages) STMICROELECTRONICS

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16-bit general purpose timer (TIM2/TIM3)

RM0312

152/275

DocID022352 Rev 3

Channel configured in input

Bit 2 OC1FE: Output compare 1 fast enable.

This bit is used to accelerate the effect of an event on the trigger in input on the CC output.

0: CC1 behaves normally depending on counter and CCR1 values even when the trigger is ON. The

minimum delay to activate CC1 output when an edge occurs on the trigger input is 5 clock cycles.

1: An active edge on the trigger input acts like a compare match on CC1 output. Then, OC is set to

the compare level independently from the result of the comparison. Delay to sample the trigger input

and to activate CC1 output is reduced to 3 clock cycles. OCFE acts only if the channel is configured

in PWM1 or PWM2 mode.

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 TI1FP1.

10: CC1 channel is configured as input, IC1 is mapped on TI2FP1.

11: Reserved

Note: CC1S bits are writable only when the channel is OFF (CC1E= ’0’ in TIMx_CCER1 and

updated).

654

3210

IC1F[3:0]

IC1PSC[1:0]

CC1S[1:0]

Bits 7:4 IC1F: 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 fMASTER

0001: fSAMPLING=fMASTER, N=2

0010: fSAMPLING=fMASTER, N=4

0011: fSAMPLING=fMASTER, N=8

0100: fSAMPLING=fMASTER/2, N=6

0101: fSAMPLING=fMASTER/2, N=8

0110: fSAMPLING=fMASTER/4, N=6

0111: fSAMPLING=fMASTER/4, N=8

1000: fSAMPLING=fMASTER/8, N=6

1001: fSAMPLING=fMASTER/8, N=8

1010: fSAMPLING=fMASTER/16, N=5

1011: fSAMPLING=fMASTER/16, N=6

1100: fSAMPLING=fMASTER/16, N=8

1101: fSAMPLING=fMASTER/32, N=5

1110: fSAMPLING=fMASTER/32, N=6

1111: fSAMPLING=fMASTER/32, N=8

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