HD6473032F16 Datasheet, PDF (249/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Figure 8.9 shows a sample setup procedure for normal mode.
Section 8 DMA Controller
Normal mode
Set initial source address 1
Set initial destination address 2
Set transfer count
3
Set DTCRB (1)
4
Set DTCRA (1)
5
Read DTCRB
6
Set DTCRB (2)
7
Read DTCRA
8
Set DTCRA (2)
9
1. Set the initial source address in MARA.
2. Set the initial destination address in MARB.
3. Set the transfer count in ETCRA.
4. Set the DTCRB bits as follows.
• Clear the DTME bit to 0.
• Set the DAID and DAIDE bits to select
whether MARB is incremented,
decremented, or held fixed.
• Select the DMAC activation source with bits
DTS2B to DTS0B.
5. Set the DTCRA bits as follows.
• Clear the DTE bit to 0.
• Select byte or word size with the DTSZ bit.
• Set the SAID and SAIDE bits to select
whether MARA is incremented,
decremented, or held fixed.
• Set or clear the DTIE bit to enable or
disable the CPU interrupt at the end of the
transfer.
• Clear the DTS0A bit to 0 and set the
DTS2A and DTS1A bits to 1 to select
normal mode.
6. Read DTCRB with DTME cleared to 0.
7. Set the DTME bit to 1 in DTCRB.
8. Read DTCRA with DTE cleared to 0.
9. Set the DTE bit to 1 in DTCRA to enable the
transfer.
Normal mode
Note: Carry out settings 1 to 9 with the DEND interrupt masked in the CPU.
If an NMI interrupt occurs during the setup procedure, it may clear the DTME bit to 0, in
which case the transfer will not start.
Figure 8.9 Normal Mode Setup Procedure (Example)
Rev. 3.00 Mar 21, 2006 page 219 of 814
REJ09B0302-0300