RM0440 Rev 4 1317/2126
RM0440 General-purpose timers (TIM2/TIM3/TIM4/TIM5)
1343
29.5.7 TIMx capture/compare mode register 1 [alternate]
(TIMx_CCMR1)(x = 2 to 5)
Address offset: 0x018
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
Bit 2 CC2G: Capture/compare 2 generation
Refer to CC1G description
Bit 1 CC1G: Capture/compare 1 generation
This bit is set by software in order to generate an event, it is automatically cleared by
hardware.
0: No action
1: A capture/compare event is generated on channel 1:
If channel CC1 is configured as output:
CC1IF flag is set, Corresponding interrupt or DMA request is sent if enabled.
If channel CC1 is configured as input:
The current value of the counter is captured in TIMx_CCR1 register. The CC1IF flag is set,
the corresponding interrupt or DMA request is sent if enabled. The CC1OF flag is set if the
CC1IF flag was already high.
Bit 0 UG: Update generation
This bit can be set by software, it is automatically cleared by hardware.
0: No action
1: Re-initialize the counter and generates an update of the registers. Note that the prescaler
counter is cleared too (anyway the prescaler ratio is not affected). The counter is cleared if
the center-aligned mode is selected or if DIR=0 (upcounting), else it takes the auto-reload
value (TIMx_ARR) if DIR=1 (downcounting).
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
IC2F[3:0] IC2PSC[1:0] CC2S[1:0] IC1F[3:0] IC1PSC[1:0] CC1S[1:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:16 Reserved, must be kept at reset value.
Bits 15:12 IC2F[3:0]: Input capture 2 filter
Bits 11:10 IC2PSC[1:0]: Input capture 2 prescaler
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