RM0440 Rev 4 1319/2126
RM0440 General-purpose timers (TIM2/TIM3/TIM4/TIM5)
1343
29.5.8 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 output compare mode (this section) or for input capture
mode (previous 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).
Output compare mode
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res.
OC2M
[3]
Res. Res. Res. Res. Res. Res. Res.
OC1M
[3]
rw rw
1514131211109876543210
OC2CE OC2M[2:0] OC2PE OC2FE CC2S[1:0] OC1CE OC1M[2:0] OC1PE OC1FE CC1S[1:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:25 Reserved, must be kept at reset value.
Bit 24 OC2M[3]: Output Compare 2 mode - bit 3
Bits 23:17 Reserved, must be kept at reset value.
Bit 16 OC1M[3]: Output Compare 1 mode - bit 3
Bit 15 OC2CE: Output compare 2 clear enable
Bits 14:12 OC2M[2:0]: Output compare 2 mode
refer to OC1M description on bits 6:4
Bit 11 OC2PE: Output compare 2 preload enable
Bit 10 OC2FE: Output compare 2 fast enable
Bits 9:8 CC2S[1:0]: 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, tim_ic2 is mapped on tim_ti2
10: CC2 channel is configured as input, tim_ic2 is mapped on tim_ti1
11: CC2 channel is configured as input, tim_ic2 is mapped on tim_trc. This mode is working
only if an internal trigger input is selected through the TS bit (TIMx_SMCR register)
Note: CC2S bits are writable only when the channel is OFF (CC2E = 0 in TIMx_CCER).
Bit 7 OC1CE: Output compare 1 clear enable
0: tim_oc1ref is not affected by the tim_ocref_clr_int input
1: tim_oc1ref is cleared as soon as a High level is detected on tim_ocref_clr_int input
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