M30620FCAFP datasheet(466/615 Pages) RENESAS

466 / 615 page

DMAC

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-149

Figure 2.9.5. Set-up procedure of one-shot transfer mode

When software DMA request bit = “1”

Setting DMAi request cause select register

DMAi request cause select register (i = 0, 1) [Address 03B816, 03BA16]

DMiSL(i = 0, 1)

DMA request cause select bit

0 0 0 1 : Software trigger

b3 b2 b1 b0

Software DMA request bit

Set to “0”

Setting DMAi control register

DMAi control register (i = 0, 1) [Address 002C16, 003C16]

DMiCON(i = 0, 1)

Transfer unit bit select bit

1 : 8 bits

Repeat transfer mode select bit

0 : Single transfer

DMA request bit

0 : DMA not requested

DMA enable bit

0 : Disabled

Source address direction select bit

1 : Forward (Bit 4 and bit 5 cannot be set to “1” simultaneously)

Destination address direction select bit

0 : Fixed (Bit 4 and bit 5 cannot be set to “1” simultaneously)

Setting DMAi source pointer

Source pointer

Stores the source address

(b15)

(b8)

(b16)

(b23)

DMA0 source pointer [Address 002216 to 002016] SAR0

DMA1 source pointer [Address 003216 to 003016] SAR1

(b19)

Setting DMAi destination pointer

Destination pointer

Stores the destination address

(b15)

(b8)

(b16)

(b23)

DMA0 destination pointer [Address 002616 to 002416] DAR0

DMA1 destination pointer [Address 003616 to 003416] DAR1

(b19)

Setting DMAi transfer counter

Transfer counter

Set a value one less than the transfer count

(b8)

DMA0 transfer counter [Address 002916, 002816] TCR0

DMA1 transfer counter [Address 003916, 003816] TCR1

(b15)

Setting DMAi control register

DMAi control register (i = 0, 1) [Address 002C16, 003C16]

DMiCON(i = 0, 1)

DMA enable bit

1 : Enabled

Note: Clear DMA request bit simultaneously again.

Start DMA transmission

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