Datasheet

Table Of Contents
Section 7 DMA Controller (DMAC)
Page 188 of 846 REJ09B0140-0900 Rev. 9.00
Sep 16, 2010
H8S/2215 Group
Transfer requests (activation sources) consist of A/D conversion end interrupt, SCI transmission
complete and reception complete interrupts, and TPU channel 0 to 2 compare match/input capture
A interrupts. For details, see section 7.3.4, DMA Control Register (DMACR). Figure 7.14 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 transfer source address in 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.
· Select MARB increment/decrement/fixed with
DAID and DAIDE bits.
· Select the activation source with bits DTF3 to
DTF0.
[5] Read the DTE = 0 and DTME = 0 in DMABCRL.
[6] Set each bit in DMABCRL.
· Specify enabling or desabling 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 7.14 Example of Block Transfer Mode Setting Procedure