H8SXSLASH1663M datasheet(580/1504 Pages) RENESAS

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Section 11 EXDMA Controller (EXDMAC)

Rev. 2.00 Sep. 24, 2008 Page 548 of 1468

REJ09B0412-0200

11.7

Ending EXDMA Transfer

The operation for ending EXDMA transfer depends on the transfer end conditions. When

EXDMA transfer ends, the DTE bit and the ACT bit in EDMDR change from 1 to 0, indicating

that EXDMA transfer has ended.

(1)

Transfer End by EDTCR Change from 1, 2, or 4 to 0

When the value of EDTCR changes from 1, 2, or 4 to 0, EXDMA transfer ends on the

corresponding channel. The DTE bit in EDMDR is cleared to 0, and the DTIF bit in EDMDR is

set to 1. If the DTIE bit in EDMDR is set to 1 at this time, a transfer end interrupt request is

generated by the transfer counter. EXDMA transfer does not end if the EDTCR value has been 0

since before the start of transfer.

(2)

Transfer End by Transfer Size Error Interrupt

When the following conditions are satisfied while the TSEIE bit in EDMDR is set to 1, a transfer

size error occurs and an EXDMA transfer is terminated. At this time, the DTE bit in EDMDR is

cleared to 0 and the ESIF bit in EDMDR is set to 1.

• In normal transfer mode and repeat transfer mode, when the next transfer is requested while a

transfer is disabled due to the EDTCR value less than the data access size.

• In block transfer mode, when the next transfer is requested while a transfer is disabled due to

the EDTCR value less than the block size.

• In cluster transfer mode, when the next transfer is requested while a transfer is disabled due to

the EDTCR value less than the cluster size.

When the TSEIE bit in EDMDR is cleared to 0, data is transferred until the EDTCR value reaches

0. A transfer size error is not generated. Operation in each transfer mode is described below.

• In normal transfer mode and repeat mode, when the EDTCR value is less than the data access

size, data is transferred in bytes.

• In block transfer mode, when the EDTCR value is less than the block size, the specified size of

data in EDTCR is transferred instead of transferring the block size of data. When the EDTCR

value is less than the data access size, data is transferred in bytes.

• In cluster transfer mode, when the EDTCR value is less than the cluster size, the specified size

of data in EDTCR is transferred instead of transferring the cluster size of data. When the

EDTCR value is less than the data access size, data is transferred in bytes.

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