M30620FCAFP datasheet(464/615 Pages) RENESAS

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DMAC

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-147

Figure 2.9.3. DMAC-related registers (2)

(b8)

(b15)

Function

• Transfer counter

Set a value one less than the transfer count

Symbol

Address

When reset

TCR0

002916, 002816

Indeterminate

TCR1

003916, 003816

Indeterminate

DMAi transfer counter (i = 0, 1)

Transfer count

specification

000016 to FFFF16

(b23)

(b8)

(b16)(b15)

(b19)

Function

• Source pointer

Stores the source address

Symbol

Address

When reset

SAR0

002216 to 002016

Indeterminate

SAR1

003216 to 003016

Indeterminate

DMAi source pointer (i = 0, 1)

Transfer address

specification

0000016 to FFFFF16

Nothing is assigned.

In an attempt to write to these bits, write “0”. The value, if read, turns out to be “0”.

Symbol

Address

When reset

DAR0

002616 to 002416

Indeterminate

DAR1

003616 to 003416

Indeterminate

(b8)

(b15)

(b16)

(b19)

Function

• Destination pointer

Stores the destination address

DMAi destination pointer (i = 0, 1)

Transfer address

specification

0000016 to FFFFF16

(b23)

Nothing is assigned.

In an attempt to write to these bits, write “0”. The value, if read, turns out to be “0”.

DMAi control register

Symbol

Address

When reset

DMiCON(i=0,1)

002C16, 003C16

00000X002

Bit name

Function

Bit symbol

Transfer unit bit select bit

0 : 16 bits

1 : 8 bits

DMBIT

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)

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