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7721 Datasheet(PDF) 309 Page - Renesas Technology Corp

Part # 7721
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 Datasheet(HTML) 309 Page - Renesas Technology Corp

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7721 Group User’s Manual
13-30
DMA CONTROLLER
13.4 Operation
13.4 Operation
Operation of 1-unit transfer varies according to the data transfer method (2-bus cycle or 1-bus cycle transfer).
In addition, how many units of transfer data are transferred for a DMA request varies according to the
transfer mode (burst transfer or cycle-steal transfer mode).
These data transfer methods and modes are described below.
13.4.1 2-bus cycle transfer
When the transfer method select bit (Refer to “Figure 13.2.6.”) = “0,” 2-bus cycle transfer is selected. 2-
bus cycle transfer is the method used to transfer data between memories. Since this method has a read
and a write cycle, it consumes a minimum of 2 bus cycles for 1-unit transfer.
Figure 13.4.1 shows an example of connecting external memories in 2-bus cycle transfer.
Fig. 13.4.1 Example of connecting external memories in 2-bus cycle transfer
M37721
Address bus
E
BHE
BLE
R/W
Data bus D8–D15
Data bus D0–D7
Note. The external circuit such as an address latch is disregarded.



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