7721 datasheet(351/577 Pages) RENESAS

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DMA CONTROLLER

13-72

13.7 Array chain transfer mode

7721 Group User’s Manual

13.7.2 Setting of array chain transfer mode

Figures 13.7.3 through 13.7.5 show an initial setting example for registers relevant to the array chain

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.

When a DMAi interrupt is used, the setting for enabling the interrupt is also required. For details, refer to

“CHAPTER 7. INTERRUPTS.”

Fig. 13.7.3 Initial setting example for registers relevant to array chain transfer mode (1)

When external DMA source is selected

When internal DMA source is selected

Setting interrupt priority level

DMAi interrupt control register (i = 0 to 3)

(Addresses 6C16 to 6F16)

Interrupt priority level select bits

When using interrupts, set these bits to one of

levels 1 to 7.

When disabling interrupts, set these bits to

level 0.

Continue to “Figure 13.7.4” on next page.

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

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