3069RF-ZTAT Datasheet, PDF (249/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER

Figure 7.9 shows a sample setup procedure for normal mode.
Normal mode
[1] Set the initial source address in MARA.
[2] Set the initial destination address in MARB.
[3] Set the transfer count in ETCRA.
Set initial source address
[1]
[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.
Set initial destination address [2]
• Select the DMAC activation source with bits
DTS2B to DTS0B.
[5] Set the DTCRA bits as follows.
Set transfer count
[3]
• 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 DTCRB (1)
[4]
• 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
Set DTCRA (1)
[5]
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.
Read DTCRB
[6] [9] Set the DTE bit to 1 in DTCRA to enable the transfer.
Set DTCRB (2)
[7]
Read DTCRA
[8]
Set DTCRA (2)
[9]
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 7.9 Normal Mode Setup Procedure (Example)
Rev. 5.0, 09/04, page 227 of 978