M16CSLASH26 datasheet(78/239 Pages) RENESAS

78 / 239 page

Renesas Technology Corp.

DMAC

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Figure 1.11.5. Example of the transfer cycles for a source read

BCLK

Address

bus

RD signal

WR signal

Data

bus

CPU use

Source

Destination

Dummy

cycle

Dummy

cycle

(1) 8-bit transfers

16-bit transfers and the source address is even.

BCLK

Address

bus

RD signal

WR signal

Data

bus

CPU use

Source

Destination

Dummy

cycle

Dummy

cycle

(3) One wait is inserted into the source read under the conditions in (1)

BCLK

Address

bus

RD signal

WR signal

Data

bus

CPU use

Source

Destination

Dummy

cycle

Dummy

cycle

Source + 1

(2) 16-bit transfers and the source address is odd

BCLK

Address

bus

RD signal

WR signal

Data

bus

CPU use

Source

Destination

Dummy

cycle

Dummy

cycle

Source + 1

(4) One wait is inserted into the source read under the conditions in (2)

Note: The same timing changes occur with the respective conditions at the destination as at the source

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