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General-purpose timer (TIMx)
RM0008
To force an output compare signal (ocxref/OCx) to its active level, you just need to write 101
in the OCxM bits in the corresponding TIMx_CCMRx register. Thus ocxref is forced high
(OCxREF is always active high) and OCx get opposite value to CCxP polarity bit.
e.g.: CCxP=0 (OCx active high) => OCx is forced to high level.
ocxref signal can be forced low by writing the OCxM bits to 100 in the TIMx_CCMRx
register.
Anyway, the comparison between the TIMx_CCRx shadow register and the counter is still
performed and allows the flag to be set. Interrupt and DMA requests can be sent
accordingly. This is described in the Output Compare Mode section.
14.3.8
Output compare mode
This function is used to control an output waveform or indicating when a period of time has
elapsed.
When a match is found between the capture/compare register and the counter, the output
compare function:
●
●
●
●
Assigns the corresponding output pin to a programmable value defined by the output
compare mode (OCxM bits in the TIMx_CCMRx register) and the output polarity (CCxP
bit in the TIMx_CCER register). The output pin can keep its level (OCXM=000), be set
active (OCxM=001), be set inactive (OCxM=010) or can toggle (OCxM=011) on match.
Sets a flag in the interrupt status register (CCxIF bit in the TIMx_SR register).
Generates an interrupt if the corresponding interrupt mask is set (CCXIE bit in the
TIMx_DIER register).
Sends a DMA request if the corresponding enable bit is set (CCxDE bit in the
TIMx_DIER register, CCDS bit in the TIMx_CR2 register for the DMA request
selection).
The TIMx_CCRx registers can be programmed with or without preload registers using the
OCxPE bit in the TIMx_CCMRx register.
In output compare mode, the update event UEV has no effect on ocxref and OCx output.
The timing resolution is one count of the counter. Output compare mode can also be used to
output a single pulse (in One Pulse Mode).
Procedure:
1.
2.
3.
4.
5.
Select the counter clock (internal, external, prescaler).
Write the desired data in the TIMx_ARR and TIMx_CCRx registers.
Set the CCxIE and/or CCxDE bits if an interrupt and/or a DMA request is to be
generated.
Select the output mode. For example, you must write OCxM=’011’, OCxPE=’0’,
CCxP=’0’ and CCxE=’1’ to toggle OCx output pin when CNT matches CCRx, CCRx
preload is not used, OCx is enabled and active high.
Enable the counter by setting the CEN bit in the TIMx_CR1 register.
The TIMx_CCRx register can be updated at any time by software to control the output
waveform, provided that the preload register is not enabled (OCxPE=’0’, else TIMx_CCRx
shadow register is updated only at the next update event UEV). An example is given in
Figure 128 .
338/995
Doc ID 13902 Rev 9
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