H8SX1663 datasheet(391/1158 Pages) RENESAS

391 / 1158 page

Section 7 DMA Controller (DMAC)

Rev.1.00 Jun. 07, 2006 Page 339 of 1102

REJ09B0294-0100

Bit

Bit Name

Initial

Value

R/W

Description

SARA4

SARA3

SARA2

SARA1

SARA0

R/W

Source Address Extended Repeat Area

Specify the extended repeat area on the source address

(DSAR). With the extended repeat area, the specified

lower address bits are updated and the remaining upper

address bits are fixed. The extended repeat area size is

specified from four bytes to 128 Mbytes in units of byte

and a power of 2.

When the lower address is overflowed from the

extended repeat area by address update, the address

becomes the start address and the end address of the

area for address addition and subtraction, respectively.

When an overflow in the extended repeat area occurs

with the SARIE bit set to 1, an interrupt can be

requested. Table 7.3 shows the settings and areas of

the extended repeat area.

DARIE

R/W

Destination Address Extended Repeat Area Overflow

Interrupt Enable

Enables/disables an interrupt request for an extended

area overflow on the destination address.

When an extended repeat area overflow on the

destination address occurs while this bit is set to 1, the

DTE bit in DMDR is cleared to 0. At this time, the ESIF

bit in DMDR is set to 1 to indicate an interrupt by an

extended repeat area overflow on the destination

address is requested.

When block transfer mode is used with the extended

repeat area function, an interrupt is requested after

completion of a 1-block size transfer. When setting the

DTE bit in DMDR of the channel for which the transfer

has been stopped to 1, the transfer is resumed from the

state when the transfer is stopped.

When the extended repeat area is not specified, this bit

is ignored.

0: Disables an interrupt request for an extended area

overflow on the destination address

1: Enables an interrupt request for an extended area

overflow on the destination address

6, 5



All 0

Reserved

These bits are always read as 0 and cannot be

modified.

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