r4f2456 Renesas Electronics Corporation., r4f2456 Datasheet - Page 432

• Manufacturer Part Number: r4f2456
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 8 EXDMA Controller (EXDMAC)
8.3.5
EDACR specifies address register incrementing/decrementing and use of the repeat area function.
Rev. 1.00 Sep. 19, 2008 Page 402 of 1342
REJ09B0467-0100
Bit
15
14
13
Bit Name
SAT1
SAT0
SARIE
EXDMA Address Control Register (EDACR)
Initial Value
0
0
0
R/W
R/W
R/W
R/W
Description
Source Address Update Mode
These bits specify incrementing/decrementing of
the transfer source address (EDSAR). When an
external device with DACK is designated as the
transfer source in single address mode, the
specification by these bits is ignored.
0×: Fixed
10: Incremented (+1 in byte transfer, +2 in word
11: Decremented (–1 in byte transfer, –2 in word
Source Address Repeat Interrupt Enable
When this bit is set to 1, in the event of source
address repeat area overflow, the IRF bit is set to
1 and the EDA bit cleared to 0 in EDMDR, and
transfer is terminated. If the EDIE bit in EDMDR is
1 when the IRF bit in EDMDR is set to 1, an
interrupt request is sent to the CPU.
When used together with block transfer mode, a
source address repeat interrupt is requested at the
end of a block-size transfer. If the EDA bit is set to
1 in EDMDR for the channel on which transfer is
terminated by a source address repeat interrupt,
transfer can be resumed from the state in which it
ended. If a source address repeat area has not
been designated, this bit is ignored.
0: Source address repeat interrupt is not
1: When source address repeat area overflow
requested
occurs, the IRF bit in EDMDR is set to 1 and an
interrupt is requested
transfer)
transfer)