M16C Datasheet, PDF (73/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

DMAC
Preliminary Specifications REV.B
Mitsubishi microcomputers
Specifications in this manual are tentative and subject to change.
M16C / 6N Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Address bus
DMA0 transfer counter reload register TCR0 (16)
(addresses 002916, 002816)
DMA0 transfer counter TCR0 (16)
DMA1 transfer counter reload register TCR1 (16)
(addresses 003916, 003816)
DMA1 transfer counter TCR1 (16)
DMA0 source pointer SAR0(20)
(addresses 002216 to 002016)
DMA0 destination pointer DAR0 (20)
(addresses 002616 to 002416)
DMA0 forward address pointer (20) (Note)
DMA1 source pointer SAR1 (20)
(addresses 003216 to 003016)
DMA1 destination pointer DAR1 (20)
(addresses 003616 to 003416)
DMA1 forward address pointer (20) (Note)
DMA latch high-order bits DMA latch low-order bits
Data bus low-order bits
Data bus high-order bits
Figure 7-1. Block diagram of DMAC
Note: Pointer is incremented by a DMA request.
DMA0 request cause select register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
DM0SL
Address
03B816
When reset
0016
Bit symbol
DSEL0
Bit name
DMA request cause
select bit
DSEL1
DSEL2
DSEL3
Function
RW
b3 b2 b1 b0
0 0 0 0 : Falling edge of INT0 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
0 1 1 0 : Timer A4 (DMS=0)
/two edges of INT0 pin (DMS=1)
0 1 1 1 : Timer B0 (DMS=0)
Timer B3 (DMS=1)
1 0 0 0 : Timer B1 (DMS=0)
Timer B4 (DMS=1)
1 0 0 1 : Timer B2 (DMS=0)
Timer B5 (DMS=1)
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
Nothing is assigned.
These bits can neither be set nor reset. When read, the value of these bits is “0”.
DMS
DSR
DMA request cause
expansion bit
Software DMA
request bit
0 : Normal
1 : Expanded cause
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”)
Figure 7-2. DMAC register (1)
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