
Mitsubishi microcomputers
M16C / 62A Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
DMAC
70
DMAi control register
Symbol
DMiCON(i=0,1)
Address
002C
16
, 003C
16
When reset
00000X00
2
Bit name
Function
Bit symbol
Transfer unit bit select bit
b7
b6
b5
b4
b3
b2
b1
b0
0 : 16 bits
1 : 8 bits
DMBIT
R
AA
AA
AA
AA
AA
A
W
DMASL
DMAS
DMAE
Repeat transfer mode
select bit
0 : Single transfer
1 : Repeat transfer
DMA request bit (Note 1)
0 : DMA not requested
1 : DMA requested
0 : Disabled
1 : Enabled
0 : Fixed
1 : Forward
DMA enable bit
Source address direction
select bit (Note 3)
Destination address
direction select bit (Note 3)
0 : Fixed
1 : Forward
DSD
DAD
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.
(Note 2)
A
A
A
DMA1 request cause select register
Symbol
DM1SL
Address
03BA
16
When reset
00
16
Function
Bit symbol
b7
b6
b5
b4
b3
b2
b1
b0
DMA request cause
select bit
DSEL0
R
AA
W
DSEL1
DSEL2
DSEL3
Nothing is assigned.
In an attempt to write to these bits, write “0”. The value, if read, turns out to be “0”.
Software DMA
request bit
If software trigger is selected, a
DMA request is generated by
setting this bit to “1” (When read,
the value of this bit is always “0”)
DSR
b3 b2 b1 b0
0 0 0 0 : Falling edge of INT1 pin
0 0 0 1 : Software trigger
0 0 1 0 : Timer A0
0 0 1 1 : Timer A1
0 1 0 0 : Timer A2
0 1 0 1 : Timer A3(DMS=0)
/serial I/O3 (DMS=1)
0 1 1 0 : Timer A4 (DMS=0)
/serial I/O4 (DMS=1)
0 1 1 1 : Timer B0 (DMS=0)
/two edges of INT1 (DMS=1)
1 0 0 0 : Timer B1
1 0 0 1 : Timer B2
1 0 1 0 : UART0 transmit
1 0 1 1 : UART0 receive
1 1 0 0 : UART2 transmit
1 1 0 1 : UART2 receive
1 1 1 0 : A-D conversion
1 1 1 1 : UART1 receive
AA
AA
AA
AA
AA
Bit name
DMA request cause
expansion select bit
DMS
0 : Normal
1 : Expanded cause
AA
Figure 1.13.3. DMAC register (2)