H8SSLASH2224 datasheet(341/1071 Pages) RENESAS

341 / 1071 page

Section 8 DMA Controller (DMAC)

Rev. 5.00 Aug 08, 2006 page 255 of 982

REJ09B0054-0500

Transfer requests (activation sources) consist of A/D converter conversion end interrupts, external

requests, SCI transmit-data-empty and receive-data-full interrupts, and TPU channel 0 to 5

compare match/input capture A interrupts.

Figure 8.17 shows an example of the setting procedure for block transfer mode.

Block transfer

mode setting

Set DMABCRH

Set transfer source

and transfer destination

addresses

Set number of transfers

Set DMACR

Read DMABCRL

Set DMABCRL

Block transfer mode

[1]

[2]

[3]

[4]

[5]

[6]

[1]

Set each bit in DMABCRH.

Set the FAE bit to 1 to select full address

mode.

Specify enabling or disabling of internal

interrupt clearing with the DTA bit.

[2]

Set the transfer source address in MARA, and

the transfer destination address in MARB.

[3]

Set the block size in both ETCRAH and

ETCRAL. Set the number of transfers in

ETCRB.

[4]

Set each bit in DMACRA and DMACRB.

Set the transfer data size with the DTSZ bit.

Specify whether MARA is to be incremented,

decremented, or fixed, with the SAID and

SAIDE bits.

Set the BLKE bit to 1 to select block transfer

mode.

Specify whether the transfer source or the

transfer destination is a block area with the

BLKDIR bit.

Specify whether MARB is to be incremented,

decremented, or fixed, with the DAID and

DAIDE bits.

Select the activation source with bits DTF3 to

DTF0.

[5]

Read DTE = 0 and DTME = 0 in DMABCRL.

[6]

Set each bit in DMABCRL.

Specify enabling or disabling of transfer end

interrupts to the CPU with the DTIE bit.

Set both the DTME bit and the DTE bit to 1 to

enable transfer.

Figure 8.17 Example of Block Transfer Mode Setting Procedure

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