ST STM32G0 1 Series User Manual

General-purpose timers (TIM2/TIM3/TIM4) RM0444
692/1390 RM0444 Rev 5
22.4.20 TIMx DMA control register (TIMx_DCR)(x = 2 to 4)
Address offset: 0x48
Reset value: 0x0000
22.4.21 TIMx DMA address for full transfer (TIMx_DMAR)(x = 2 to 4)
Address offset: 0x4C
Reset value: 0x0000
22.4.22 TIM2 option register 1 (TIM2_OR1)
Address offset: 0x50
Reset value: 0x0000 0000
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Res. Res. Res. DBL[4:0] Res. Res. Res. DBA[4:0]
rw rw rw rw rw rw rw rw rw rw
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).
00000: 1 transfer,
00001: 2 transfers,
00010: 3 transfers,
...
10001: 18 transfers.
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:
00000: TIMx_CR1
00001: TIMx_CR2
00010: TIMx_SMCR
...
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.
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DMAB[15:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw 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
(TIMx_CR1 address) + (DBA + DMA index) x 4
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).

ST STM32G0 1 Series Specifications

General

Brand	ST
Model	STM32G0 1 Series
Category	Microcontrollers
Language	English