7721 datasheet(453/577 Pages) RENESAS

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APPLICATION

7721 Group User’s Manual

16–50

16.2 Examples of using DMA controller

(2)

Initial setting example for relevant register

DMA1 mode register L (Address 1FDC16)

Transfer unit : 8 bits

2-bus cycle transfer

Cycle-steal transfer mode

Transfer source address direction : At regular turning ; “012” (Forward)

At reverse turning ; “102” (Backward)

Transfer destination address direction : Fixed

DMA1 mode register H (Address 1FDD16)

Transfer source Wait

No transfer destination Wait

Repeat transfer mode

011000

Source address register 1 (Addresses 1FD216 to 1FD016)

Phase output data table’s start address

b23

b16 b15

b8 b7

Phase output data table’s data number

b23

b16 b15

b8 b7

Pulse output data register 0’s address

b23

b16 b15

b8 b7

0016

1A16

DMA1 control register (Address 1FDE16)

DMA request source : Timer A0

DMAACK1 pin : Invalid

000

DMA1 interrupt control register (Address 6D16)

Interrupt disabled

000

Destination address register 1 (Addresses 1FD616 to 1FD416)

Transfer counter register 1 (Addresses 1FDA16 to 1FD816)

! : It may be “0” or “1.”

Fig. 16.2.8 Initial setting example for relevant register (1)

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