RM0440 Rev 4 419/2126
RM0440 Direct memory access controller (DMA)
423
Bit 5 CIRC: circular mode
0: disabled
1: enabled
Note: this bit is set and cleared by software.
It must not be written when the channel is enabled (EN = 1).
It is not read-only when the channel is enabled (EN = 1).
Bit 4 DIR: data transfer direction
This bit must be set only in memory-to-peripheral and peripheral-to-memory modes.
0: read from peripheral
– Source attributes are defined by PSIZE and PINC, plus the DMA_CPARx register.
This is still valid in a memory-to-memory mode.
– Destination attributes are defined by MSIZE and MINC, plus the DMA_CMARx
register. This is still valid in a peripheral-to-peripheral mode.
1: read from memory
– Destination attributes are defined by PSIZE and PINC, plus the DMA_CPARx
register. This is still valid in a memory-to-memory mode.
– Source attributes are defined by MSIZE and MINC, plus the DMA_CMARx register.
This is still valid in a peripheral-to-peripheral mode.
Note: this bit is set and cleared by software.
It must not be written when the channel is enabled (EN = 1).
It is read-only when the channel is enabled (EN = 1).
Bit 3 TEIE: transfer error interrupt enable
0: disabled
1: enabled
Note: this bit is set and cleared by software.
It must not be written when the channel is enabled (EN = 1).
It is not read-only when the channel is enabled (EN = 1).
Bit 2 HTIE: half transfer interrupt enable
0: disabled
1: enabled
Note: this bit is set and cleared by software.
It must not be written when the channel is enabled (EN = 1).
It is not read-only when the channel is enabled (EN = 1).
Bit 1 TCIE: transfer complete interrupt enable
0: disabled
1: enabled
Note: this bit is set and cleared by software.
It must not be written when the channel is enabled (EN = 1).
It is not read-only when the channel is enabled (EN = 1).
Bit 0 EN: channel enable
When a channel transfer error occurs, this bit is cleared by hardware. It can not be set again
by software (channel x re-activated) until the TEIFx bit of the DMA_ISR register is cleared (by
setting the CTEIFx bit of the DMA_IFCR register).
0: disabled
1: enabled
Note: this bit is set and cleared by software.
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