Timx Dma Control Register (Timx_Dcr) - ST STM32L4x6 Reference Manual

General-purpose timers (TIM2/TIM3/TIM4/TIM5)
27.4.17

TIMx DMA control register (TIMx_DCR)

Address offset: 0x48
Reset value: 0x0000
15 14 13
Res. Res. Res.
Bits 15:13 Reserved, must be kept at reset value.
Bits 12:8 DBL[4:0]: DMA burst length
This 5-bit vector defines the number of DMA transfers (the timer recognizes a burst transfer
when a read or a write access is done to the TIMx_DMAR address).
Bits 7:5 Reserved, must be kept at reset value.
Bits 4:0 DBA[4:0]: DMA base address
This 5-bit vector defines the 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: Let us consider the following transfer: DBL = 7 transfers & DBA = TIMx_CR1. In this
case the transfer is done to/from 7 registers starting from the TIMx_CR1 address.
27.4.18 TIMx DMA address for full transfer (TIMx_DMAR)
Address offset: 0x4C
Reset value: 0x0000
15 14 13
rw rw rw
Bits 15:0 DMAB[15:0]: DMA register for burst accesses
A read or write operation to the DMAR register accesses the register located at the address
where TIMx_CR1 address is the address of the control register 1, DBA is the DMA base
address configured in TIMx_DCR register, DMA index is automatically controlled by the DMA
transfer, and ranges from 0 to DBL (DBL configured in TIMx_DCR).
924/1693
12 11 10 9
DBL[4:0]
rw rw rw rw
00000: 1 transfer,
00001: 2 transfers,
00010: 3 transfers,
...
10001: 18 transfers.
Example:
00000: TIMx_CR1
00001: TIMx_CR2
00010: TIMx_SMCR
...
12 11 10 9
rw rw rw rw
(TIMx_CR1 address) + (DBA + DMA index) x 4
8 7 6
Res. Res.
rw
8 7 6
DMAB[15:0]
rw rw rw
DocID024597 Rev 3
5 4 3 2
Res. DBA[4:0]
rw rw rw
5 4 3 2
rw rw rw rw
RM0351
1 0
rw rw
1 0
rw rw