Mitsubishi microcomputers
M16C / 61 Group
DMAC
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
DMAi request cause select register
Symbol
DMiSL(i=0,1)
Address
03B816,03BA16
When reset
0016
b7 b6 b5 b4 b3 b2 b1 b0
Function
Bit symbol
DSEL0
Bit name
R
W
b3 b2 b1 b0
DMA request cause
select bit
0 0 0 0 : Falling edge of INT0 / INT1
pin (Note 1)
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
0 1 1 0 : Timer A4
0 1 1 1 : Timer B0
1 0 0 0 : Timer B1
1 0 0 1 : Timer B2
DSEL1
DSEL2
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 transmit / UART1
receive (Note 2)
DSEL3
Nothing is assigned.
In an attempt to write to these bits, write “0”. The value, if read, turns out to be “0”.
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”)
Software DMA request bit
DSR
Note 1: Address 03B816 is for INT0 ; address 03BA16 is for INT1.
Note 2: Address 03B816 is for UART1 transmit ; address 03BA16 is for UART1 receive.
DMAi control register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
DMiCON(i=0,1)
Address
002C16, 003C16
When reset
00000X00
2
Bit symbol
DMBIT
Bit name
Function
R
W
Transfer unit bit select bit 0 : 16 bits
1 : 8 bits
Repeat transfer mode
select bit
0 : Single transfer
1 : Repeat transfer
DMASL
DMAS
DMAE
0 : DMA not requested
1 : DMA requested
DMA request bit (Note 1)
DMA enable bit
(Note 2)
0 : Disabled
1 : Enabled
Source address direction
select bit (Note 3)
0 : Fixed
1 : Forward
DSD
DAD
Destination address
direction select bit (Note 3)
0 : Fixed
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 1.15.2. DMAC register (1)
63
MITSUBISHI [ Mitsubishi Group ]
