H8S2456 Datasheet, PDF (433/1376 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8S Family / H8S/2400 Series

Bit Bit Name Initial Value R/W
12 SARA4
0
R/W
11 SARA3
0
R/W
10 SARA2
0
R/W
9
SARA1
0
R/W
8
SARA0
0
R/W
Section 8 EXDMA Controller (EXDMAC)
Description
Source Address Repeat Area
These bits specify the source address (EDSAR)
repeat area. The repeat area function updates the
specified lower address bits, leaving the remaining
upper address bits always the same. A repeat
area size of 2 bytes to 8 Mbytes can be specified.
The setting interval is a power-of-two number of
bytes. When repeat area overflow results from
incrementing or decrementing an address, the
lower address is the start address of the repeat
area in the case of address incrementing, or the
last address of the repeat area in the case of
address decrementing. If the SARIE bit is set to 1,
an interrupt can be requested when repeat area
overflow occurs.
00000: Not designated as repeat area
00001: Lower 1 bit (2-byte area) designated as
repeat area
00010: Lower 2 bits (4-byte area) designated as
repeat area
00011: Lower 3 bits (8-byte area) designated as
repeat area
00100: Lower 4 bits (16-byte area) designated as
repeat area
:
:
10011: Lower 19 bits (512-Kbyte area) designated
as repeat area
10100: Lower 20 bits (1-Mbyte area) designated
as repeat area
10101: Lower 21 bits (2-Mbyte area) designated
as repeat area
10110: Lower 22 bits (4-Mbyte area) designated
as repeat area
10111: Lower 23 bits (8-Mbyte area) designated
as repeat area
11×××: Setting prohibited
Rev. 1.00 Sep. 19, 2008 Page 403 of 1342
REJ09B0467-0100