r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 518

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 9 Data Transfer Controller (DTC)
9.7.4
An example is shown in which the DTC is used to transfer a block of 128 bytes of data by means
of software activation. The transfer source address is H'1000 and the destination address is
H'2000. The vector number is H'60, so the vector address is H'04C0.
1. Set MRA to incrementing source address (SM1 = 1, SM0 = 0), incrementing destination
2. Set the start address of the register information at the DTC vector address (H'04C0).
3. Check that the SWDTE bit in DTCCR is 0. Check that there is currently no transfer activated
4. Write 1 to the SWDTE bit and the vector number (H'60) to DTVECR. The write data is H'60.
5. Read DTVECR again and check that it is set to the vector number (H'60). If it is not, this
6. If the write was successful, the DTC is activated and a block of 128 bytes of data is transferred.
7. After the transfer, an SWDTEND interrupt occurs. The interrupt handling routine should clear
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address (DM1 = 1, DM0 = 0), block transfer mode (MD1 = 1, MD0 = 0), and byte size (Sz =
0). The DTS bit can have any value. Set MRB for one block transfer by one interrupt (CHNE =
0). Set the transfer source address (H'1000) in SAR, the destination address (H'2000) in DAR,
and 128 (H'8080) in CRA. Set 1 (H'0001) in CRB.
by software.
indicates that the write failed. This is presumably because an interrupt occurred between steps
3 and 4 and led to a different software activation. To activate this transfer, go back to step 3.
the SWDTE bit to 0 and perform other wrap-up processing.
Software Activation