HD6432138SW datasheet(240/1061 Pages) RENESAS

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Section 7 Data Transfer Controller [H8S/2138 Group]

Rev. 4.00 Jun 06, 2006 page 186 of 1004

REJ09B0301-0400

Software Activation: 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

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.

2. Set the start address of the register information at the DTC vector address (H'04C0).

3. Check that the SWDTE bit in DTVECR is 0. Check that there is currently no transfer activated

by software.

4. Write 1 to the SWDTE bit and the vector number (H'60) to DTVECR. The write data is H'E0.

5. Read DTVECR again and check that it is set to the vector number (H'60). If it is not, this

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.

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

the SWDTE bit to 0 and perform other wrap-up processing.

HD6432138SW Datasheet(PDF) 240 Page - Renesas Technology Corp