6-14
Seiko Epson Corporation
S1C31D50 TECHNICAL MANUAL
(Rev. 1.00)
DMAC Configuration Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
DMACCFG
31
–
24
–
0x00
–
R
–
23
–
16
–
0x00
–
R
15
–
8
–
0x00
–
R
–
7
–
1
–
0x00
–
R
0
MSTEN
–
–
W
Bits 31
–
1
Reserved
Bit 0
MSTEN
This bit enables the DMA controller.
1 (W): Enable
0 (W): Disable
DMAC Control Data Base Pointer Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
DMACCPTR
31
–
0
CPTR[31:0]
0x0000
0000
H0
R/W
–
Bits 31
–
0
CPTR[31:0]
These bits set the leading address of the data structure.
Depending on the number of channels implemented, low-order bits are configured for read
only.
Table 6.8.2 CPTR Writable/Read-Only Bits Depending On Number of Channel Implemented
Number of channel
implemented
Writable bits
Read-only bits
1
CPTR[31:5]
CPTR[4:0]
2
CPTR[31:6]
CPTR[5:0]
3
–
4
CPTR[31:7]
CPTR[6:0]
5
–
8
CPTR[31:8]
CPTR[7:0]
9
–
16
CPTR[31:9]
CPTR[8:0]
17
–
32
CPTR[31:10]
CPTR[9:0]
DMAC Alternate Control Data Base Pointer Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
DMACACPTR
31
–
0
ACPTR[31:0]
–
H0
R
–
Bits 31
–
0
ACPTR[31:0]
These bits show the alternate data structure base address.
DMAC Software Request Register
Register name
Bit
Bit name
Initial
Reset
R/W
Remarks
DMACSWREQ
31
–
0
SWREQ[31:0]
–
–
W
–
Bits 31
–
0
SWREQ [31:0]
These bits issue a software DMA transfer request to each channel.
1 (W): Issue a software DMA transfer request
0 (W): Ineffective
Each bit corresponds to a DMAC channel (e.g. bit
n
corresponds to Ch.
n
). The high-order
bits for the unimplemented channels are ineffective.
Summary of Contents for S1C31D50
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