R01UH0823EJ0100 Rev.1.00
Page 1444 of 1823
Jul 31, 2019
RX23W Group
40. SD Host Interface (SDHIa)
40.2.19 DMA Transfer Enable Register (SDDMAEN)
Note 1. Do not rewrite this bit when the SDSTS2.CBSY bit is 1.
Note 2. When the SDIMSK2.BWEM bit is 0 or the SDIMSK2.BREM bit is 0, set the SDDMAEN.DMAEN bit to 0. When the
SDDMAEN.DMAEN bit is 1, set the SDIMSK2.BWEM bit to 1 and the SDIMSK2.BREM bit to 1.
The SDDMAEN register enables and disables DMA transfer.
DMAEN Bit (DMA Transfer Enable)
When using DMA transfer to access the SD buffer, set the DMAEN bit to 1 before setting the SDCMD register.
SDDMAEN
Address(es): SDHI.SDDMAEN 0008 ADB0h
b31
b30
b29
b28
b27
b26
b25
b24
b23
b22
b21
b20
b19
b18
b17
b16
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Value after reset:
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
b15
b14
b13
b12
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
—
—
—
—
—
—
—
—
—
—
—
—
—
—
DMAEN
—
Value after reset:
0
0
0
1
0
0
0
0
0
0
0
1
0
0
0
0
Bit
Symbol
Bit Name
Description
R/W
b0
—
Reserved
This bit is 0 when read. Set it to 0 when writing.
R/W
b1
0: Using DMAC and DTC to access the SDBUFR register is
disabled
1: Using DMAC and DTC to access the SDBUFR register is
enabled
R/W
b3, b2
—
Reserved
These bits are 0 when read. Set them to 0 when writing.
R
b4
—
Reserved
This bit is 1 when read. Set it to 1 when writing.
R
b5
—
Reserved
This bit is 0 when read. Set it to 0 when writing.
R/W
b7, b6
—
Reserved
These bits are 0 when read and cannot be modified.
R
b9, b8
—
Reserved
These bits are 0 when read. Set them to 0 when writing.
R/W
b11, b10
—
Reserved
These bits are 0 when read and cannot be modified.
R
b12
—
Reserved
This bit is 1 when read. Set it to 1 when writing.
R
b31 to b13
—
Reserved
These bits are 0 when read and cannot be modified.
R