H8SXSLASH1663R datasheet(589/1504 Pages) RENESAS

589 / 1504 page

Section 11 EXDMA Controller (EXDMAC)

Rev. 2.00 Sep. 24, 2008 Page 557 of 1468

REJ09B0412-0200

4. Activation Source Acceptance

At the start of activation source acceptance, low level sensing is used for both falling edge

sensing and low level sensing on the

EDREQ. Therefore, a request is accepted in the case of a

low level at the

EDREQ pin that occurs before execution of the EDMDR write for setting the

transfer-enabled state.

At EXDMAC activation, low level on the

EDREQ pin must not remain at the end of the

previous transfer.

5. Conflict in Cluster Transfer

In cluster transfer mode, the same cluster buffer is used for all channels. When more than one

cluster transfer conflicts, the cluster buffer register holds the value of the last cluster transfer.

When the transfer between the transfer source/destination and the cluster buffer conflicts with

another cluster transfer, the transferred data in the cluster buffer may be overwritten by another

channel cluster transfer. Therefore, in the cluster transfer mode (single address mode), do not

set the cluster transfer mode for any other channels.

6. Cluster Transfer Mode and Endian

In cluster transfer mode, only a transfer to the areas in the big endian format is supported.

When cluster transfer mode is specified, do not specify the areas in the little endian format for

EDSAR and EDDAR. For details on the endian, see section 9, Bus Controller (BSC).

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