Rev. 2.00, 09/03, page 246 of 690
Bit
Bit
Name
Initial
Value
R/W
Descriptions
7
6
DL
DS
0
0
R/W
R/W
DREQ Level and DREQ Edge Select
Select the detection method of the DREQ pin input and the
detection level.
These bits are valid only in CHCR_0 and CHCR_1. These bits
are always read as 0 in CHCR_2 and CHCR_3. The write value
should always be 0.
In channels 0 and 1, also, if the transfer request source is
specified as an on-chip peripheral module or if an auto-request
is specified, these bits are invalid.
00: DREQ detected in low level
01: DREQ detected at falling edge
10: DREQ detected in high level
11: DREQ detected at rising edge
5
TB
0
R/W
Transfer Bus Mode
Specifies the bus mode when DMA transfers data.
0: Cycle steal mode
1: Burst mode
4
3
TS1
TS0
0
0
R/W
R/W
Transfer Size
Specify the size of data to be transferred.
Select the size of data to be transferred when the source or
destination is an on-chip peripheral module register of which
transfer size is specified.
00: Byte size
01: Word size (two bytes)
10: Longword size (four bytes)
11: 16-byte unit (four longword transfers)
2
IE
0
R/W
Interrupt Enable
Specifies whether or not an interrupt request is generated to the
CPU at the end of the DMA transfer. Setting this bit to 1
generates an interrupt request (DEI) to the CPU when the TE
bit is set to 1.
0: Interrupt request disabled
1: Interrupt request enabled
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