Datasheet

Table Of Contents
Section 7 DMA Controller (DMAC)
REJ09B0140-0900 Rev. 9.00 Page 183 of 846
Sep 16, 2010
H8S/2215 Group
Figure 7.10 shows an example of the setting procedure for normal mode.
Normal mode
setting
Set DMABCRH
Set transfer source
and transfer destination
addresses
Set number of transfers
Set DMACR
Read DMABCRL
Set DMABCRL
Normal 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 number of transfers in ETCRA.
[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.
· Clear the BLKE bit to 0 to select normal mode.
· 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 the DTE = 0 and DTME = 0 in DMABCRL.
[6] Set each bit in DMABCRL.
· Specify enabling or desabling of transfer end
interrupts with the DTIE bit.
· Set both the DTME bit and the DTE bit to 1 to
enable transfer.
Figure 7.10 Example of Normal Mode Setting Procedure