h8s-2172 Renesas Electronics Corporation., h8s-2172 Datasheet - Page 197

• Manufacturer Part Number: h8s-2172
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family H8s-2100 Series
• Manufacturer: Renesas Electronics Corporation.

7.3.5
DMACR specifies address register incrementing/decrementing and use of the repeat area function.
Bit
15
14
13
Bit Name
SAT1
SAT0
SARIE
DMA Address Control Register (DMACR)
0
Initial
Value
0
0
R/W
R/W
R/W
R/W
Source Address Repeat Interrupt Enable
Description
Source Address Update Mode
These bits specify incrementing/decrementing of the
transfer source address (DMSAR).
When an external device with DACK is designated as
the transfer source in single address mode, the
specification by these bits is ignored.
0X: Source address (DMSAR) is fixed
10: Source address is incremented (+1 in byte transfer,
11: Source address is decremented (–1 in byte transfer,
When this bit is set to 1, in the event of source address
repeat area overflow, the IRF bit in DMMDR is set to 1
and the DA bit in DMMDR cleared to 0, and transfer is
terminated. If the DIE bit in DMMDR is 1 when the IRF
bit in DMMDR 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 DA bit is set to 1 in DMMDR 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 requested
1: When source address repeat area overflow occurs,
the IRF bit in DMMDR is set to 1 and an interrupt is
requested
+2 in word transfer, or +4 in longword transfer)
–2 in word transfer, or –4 in longword transfer)
Rev. 2.00, 03/04, page 165 of 534