Normal Mode - Hitachi H8S/2378, H8S/2378R Series Hardware Manual

Single address
mode setting
Set DMABCRH
Set transfer source and
transfer destination
addresses
Set number of transfers
Set DMACR
Read DMABCRL
Set DMABCRL
Single address mode
Figure 7.10 Example of Single Address Mode Setting Procedure (When Sequential Mode is
7.5.6

Normal Mode

In normal mode, transfer is performed with channels A and B used in combination. Normal mode
can be specified by setting the FAE bit in DMABCRH to 1 and clearing the BLKE bit in
DMACRA to 0. In normal mode, MAR is updated after data transfer of a byte or word in response
[1] Set each bit in DMABCRH.
• Clear the FAE bit to 0 to select short address
mode.
• Set the SAE bit to 1 to select single address
mode.
• Specify enabling or disabling of internal
[1]
interrupt clearing with the DTA bit.
[2] Set the transfer source address/transfer
destination address in MAR.
[2]
[3] Set the number of transfers in ETCR.
[4] Set each bit in DMACR.
• Set the transfer data size with the DTSZ bit.
• Specify whether MAR is to be incremented or
[3]
decremented with the DTID bit.
• Clear the RPE bit to 0 to select sequential
mode.
• Specify the transfer direction with the DTDIR
bit.
[4]
• Select the activation source with bits DTF3 to
DTF0.
[5] Read the DTE bit in DMABCRL as 0.
[5]
[6] Set each bit in DMABCRL.
• Specify enabling or disabling of transfer end
interrupts with the DTIE bit.
• Set the DTE bit to 1 to enable transfer.
[6]
Specified)
Rev. 1.0, 09/01, page 283 of 904