H83069RF datasheet(259/1003 Pages) RENESAS

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H83069RF Datasheet(PDF) 259 Page - Renesas Technology Corp

Part #	H83069RF

Description	Renesas 16-Bit Single-Chip Microcomputer

PDF	1003 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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259 / 1003 page

Rev. 5.0, 09/04, page 237 of 978

Figure 7.15 shows an auto-requested burst-mode transfer. This example shows a transfer of three

words from a 16-bit two-state access area to another 16-bit two-state access area.

CPU cycle

DMAC cycle

Source

address

Destination

address

CPU cycle

Address

bus

HWR

LWR

Figure 7.15 Burst DMA Bus Timing

When the DMAC is activated from a

DREQ pin there is a minimum interval of four states from

when the transfer is requested until the DMAC starts operating. The

DREQ pin is not sampled

during the time between the transfer request and the start of the transfer. In short address mode

and normal mode, the pin is next sampled at the end of the read cycle. In block transfer mode, the

pin is next sampled at the end of one block transfer.

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