RM0440 Rev 4 1303/2126
RM0440 General-purpose timers (TIM2/TIM3/TIM4/TIM5)
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The DBL[4:0] bits in the TIMx_DCR register set the DMA burst length. The timer recognizes
a burst transfer when a read or a write access is done to the TIMx_DMAR address), i.e. the
number of transfers (either in half-words or in bytes).
The DBA[4:0] bits in the TIMx_DCR registers define the DMA base address for DMA
transfers (when read/write access are done through the TIMx_DMAR address). DBA is
defined as an offset starting from the address of the TIMx_CR1 register:
Example:
00000: TIMx_CR1
00001: TIMx_CR2
00010: TIMx_SMCR
As an example, the timer DMA burst feature is used to update the contents of the CCRx
registers (x = 2, 3, 4) upon an update event, with the DMA transferring half words into the
CCRx registers.
This is done in the following steps:
1. Configure the corresponding DMA channel as follows:
– DMA channel peripheral address is the DMAR register address
– DMA channel memory address is the address of the buffer in the RAM containing
the data to be transferred by DMA into CCRx registers.
– Number of data to transfer = 3 (See note below).
– Circular mode disabled.
2. Configure the DCR register by configuring the DBA and DBL bit fields as follows:
DBL = 3 transfers, DBA = 0xE.
3. Enable the TIMx update DMA request (set the UDE bit in the DIER register).
4. Enable TIMx
5. Enable the DMA channel
This example is for the case where every CCRx register has to be updated once. If every
CCRx register is to be updated twice for example, the number of data to transfer should be
6. Let's take the example of a buffer in the RAM containing data1, data2, data3, data4, data5
and data6. The data is transferred to the CCRx registers as follows: on the first update DMA
request, data1 is transferred to CCR2, data2 is transferred to CCR3, data3 is transferred to
CCR4 and on the second update DMA request, data4 is transferred to CCR2, data5 is
transferred to CCR3 and data6 is transferred to CCR4.
Note: A null value can be written to the reserved registers.
29.4.25 TIM2/TIM3/TIM4/TIM5 DMA requests
The TIM2/TIM3/TIM4/TIM5 can generate a DMA requests, as shown in Table 281.
Table 281. DMA request
DMA acronym DMA request
Enable
control bit
TIM_UP Update UDE
TIM_CH1 Capture/compare 1 CC1DE
TIM_CH2 Capture/compare 2 CC2DE
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