M16C30L Datasheet, PDF (70/166 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

DMAC
Mitsubishi microcomputers
M16C / 30L Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
DMA0 control register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
DM0CON
Address
002C16
When reset
00000X002
Bit symbol
Bit name
Function
RW
DMBIT
Transfer unit bit select bit 0 : 16 bits
1 : 8 bits
DMASL
Repeat transfer mode
select bit
0 : Single transfer
1 : Repeat transfer
DMAS
DMA request bit (Note 1) ^{0 : DMA not requested}
1 : DMA requested
(Note 2)
DMAE
DSD
DMA enable bit
Source address direction
select bit (Note 3)
0 : Disabled
1 : Enabled
0 : Fixed
1 : Forward
DAD
Destination address
0 : Fixed
direction select bit (Note 3) _{1 : Forward}
Nothing is assigned.
In an attempt to write to these bits, write “0”. The value, if read, turns out to be “0”.
Note 1: DMA request can be cleared by resetting the bit.
Note 2: This bit can only be set to “0”.
Note 3: Source address direction select bit and destination address direction select bit
cannot be set to “1” simultaneously.
Figure 1.13.3. DMAC register (2)
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