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7721 Datasheet(PDF) 342 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) 342 Page - Renesas Technology Corp

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13-63
DMA CONTROLLER
13.6 Repeat transfer mode
7721 Group User’s Manual
13.6.1 Setting of repeat transfer mode
Figures 13.6.2 through 13.6.4 show an initial setting example for registers relevant to the repeat transfer
mode. In addition, when timer A, timer B, UART, or the A-D converter is selected as a DMA request source,
the setting for the peripheral is required. For details of the setting, refer to the chapter of each peripheral
function.
In this mode, only the forced termination can terminate the DMA transfer. (Refer to section “13.3.5 (2)
Forced termination.” Therefore, in the burst transfer mode (edge sense selected), be sure to validate the
___
TC
pin.
When external DMA source is selected
When internal DMA source is selected
Continue to “Figure 13.6.3” on next page.
b7
b0
Port P9 direction register (Address 1516)
Setting port P9 direction register
DMAREQ0 pin
DMAREQ1 pin
DMAREQ2 pin
Clear the corresponding bit to “0.”
DMAREQ3 pin
Fig. 13.6.2 Initial setting example for registers relevant to repeat transfer mode (1)



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