7721 datasheet(317/577 Pages) RENESAS

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7721 Datasheet(PDF) 317 Page - Renesas Technology Corp

Part #	7721

Description	16-BIT SINGLE-CHIP MICROCOMPUTER

PDF	577 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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317 / 577 page

7721 Group User’s Manual

13-38

DMA CONTROLLER

13.4 Operation

13.4.2 1-bus cycle transfer

When the transfer method select bit (Refer to “Figure 13.2.6.”) = “1,” 1-bus cycle transfer is selected.

1-bus cycle transfer is the method used to transfer data between a memory and an I/O. In this method,

a read and write of 1-tansfer-unit data are simultaneously performed during 1-bus cycle. The address bus,

____

BHE

, BLE, and R/W indicate the states of memory.

Figure 13.4.4 shows an example of connecting external memories and I/Os in 1-bus cycle transfer.

I/O

M37721

Address bus

Data bus (D8–D15)

BHE

BLE

R/W

DMAACKi

DMAREQi

I/O

Data bus (D0–D7)

Note. The external circuit such as an address latch is disregarded.

Fig. 13.4.4 Example of connecting external memories and I/Os in 1-bus cycle transfer

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