170
Chapter 7
DMA Functions (DMA Controller)
Preliminary User’s Manual U15839EE1V0UM00
7.2 Control
Registers
7.2.1 DMA source address registers H0 to H3 (DSAH0 to DSAH3)
These registers are used to set the DMA source addresses (28 bits each) for DMA channel n
(n = 0 to 3). They are divided into two 16-bit registers, DSAHn and DSALn.
Since these registers are configured as 2-stage FIFO buffer registers, a new source address for DMA
transfer can be specified during DMA transfer (refer to 7.3 Next Address Setting Function).
(1)
DMA source address registers DSAH0 to DSAH3 (DSAH0 to DSAH3)
These registers can be read/written in 16-bit units.
Caution:
When setting an address of a peripheral I/O register for the source address, be sure
to specify an address between FFFF000H and FFFFFFFH. An address of the periph-
eral I/O register image (3FFF000H to 3FFFFFFH) must not be specified.
Figure 7-1: DMA Source Address Registers DSAH0 to DSAH3 (DSAH0 to DSAH3)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Initial
value
DSAH0
IR
0
0
0
SA26 SA26 SA25 SA24 SA23 SA22 SA21 SA20 SA19 SA18 SA17 SA16 FFFFF082H undef.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Initial
value
DSAH1
IR
0
0
0
SA26 SA26 SA25 SA24 SA23 SA22 SA21 SA20 SA19 SA18 SA17 SA16 FFFFF08AH undef.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Initial
value
DSAH2
IR
0
0
0
SA26 SA26 SA25 SA24 SA23 SA22 SA21 SA20 SA19 SA18 SA17 SA16 FFFFF092H undef.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Address
Initial
value
DSAH3
IR
0
0
0
SA26 SA26 SA25 SA24 SA23 SA22 SA21 SA20 SA19 SA18 SA17 SA16 FFFFF09AH undef.
Bit Position
Bit Name
Function
15
IR
Specifies the DMA source address.
0: External memory or On-chip peripheral I/O
1: Internal RAM
11 to 0
SA27 to
SA16
Sets the DMA source addresses (A27 to A16). During DMA transfer, it stores the next
DMA transfer source address.
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