SH7243 datasheet(246/1726 Pages) RENESAS

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Section 8 Data Transfer Controller (DTC)

Rev. 1.00 Jun. 26, 2008 Page 216 of 1692

REJ09B0393-0100

8.5

Operation

There are three transfer modes: normal, repeat, and block. Since transfer information is in the data

area, it is possible to transfer data over any required number of channels. When activated, the DTC

reads the transfer information stored in the data area and transfers data according to the transfer

information. After the data transfer is complete, it writes updated transfer information back to the

data area.

The DTC specifies the source address and destination address in SAR and DAR, respectively.

After a transfer, SAR and DAR are incremented, decremented, or fixed independently.

Table 8.3 shows the DTC transfer modes.

Table 8.3

DTC Transfer Modes

Transfer

Mode

Size of Data Transferred at One

Transfer Request

Memory Address Increment or

Decrement

Transfer

Count

Normal

1 byte/word/longword

Incremented/decremented by 1, 2, or

4, or fixed

1 to 65536

Repeat*

1 byte/word/longword

Incremented/decremented by 1, 2, or

4, or fixed

1 to 256*

Block*

Block size specified by CRAH

(1 to 256 bytes/words/longwords)

Incremented/decremented by 1, 2, or

4, or fixed

1 to 65536*

Notes: 1. Either source or destination is specified to repeat area.

2. Either source or destination is specified to block area.

3. After transfer of the specified transfer count, initial state is recovered to continue the

operation.

4. Number of transfers of the specified block size of data

Setting the CHNE bit in MRB to 1 makes it possible to perform a number of transfers with a

single activation (chain transfer). Setting the CHNS bit in MRB to 1 can also be made to have

chain transfer performed only when the transfer counter value is 0.

Figure 8.4 shows a flowchart of DTC operation, and table 8.4 summarizes the conditions for DTC

transfers including chain transfer (combinations for performing the second and third transfers are

omitted).

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