HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 456

• Manufacturer Part Number: HD64570
• Description: Serial Communications Adaptor
• Manufacturer: HITACHI [Hitachi Semiconductor]

Register
DMAC (Channel 1)
DMA Status Register
Channel 1: DSR Channel 1
DMA Mode Register
Channel 1: DMR Channel 1
Not used
Rev. 0, 07/98, page 440 of 453
CPU
Mode
0, 1
B0H
B1H
B2H
Address
CPU
Mode
2, 3
B1H
B0H
B3H
End of transfer
0:
1:
Single-block
transfer mode
Chained-block
transfer mode
Read/Write
Initial value
Single-block
transfer mode
Chained-block
transfer mode
Read/Write
Initial value
Remarks
Transfer not completed
Transfer completed
DMA transfer mode
0:
1:
Single-block transfer
Chained-block transfer
EOT
R/W
—
—
7
0
7
0
End of frame transfer
•
0:
1:
Chained-block transfer
Frame transfer not completed
Frame transfer completed
EOM
R/W
6
—
0
—
—
6
0
Buffer overflow/underflow
•
0:
1:
R/W
BOF
—
Chained-block transfer
No error detected
Error detected
5
0
—
—
5
0
Number of DMA frames
•
0:
1:
Counter overflow
•
0:
1:
Frame end interrupt counter (FCT)
enable/disable
•
Set this bit to 0
•
0:
1:
Chained-block transfer
Single frame
Multi-frame
Chained-block
transfer
No error detected
Error detected
Single-block transfer
Chained-block transfer
Frame end interrupt counter (FCT) disabled
Frame end interrupt counter (FCT) enabled
TMOD
R/W
—
COF
R/W
4
0
4
0
—
—
3
0
—
—
3
0
—
R/W
—
2
0
NF
—
2
0
DMA enable
0:
1:
Disable
Enable
R/W
DE bit write enable
0:
1:
CNTE
DE
R/W
1
0
1
0
Enable
Disable
DWE
W
0
1
—
—
0
0