HD64570 Datasheet, PDF (451/469 Pages) Hitachi Semiconductor – Serial Communications Adaptor

Register
DMAC (Channel 0)
Byte Count Register
Channel 0: BCRL
Channel 0
Address
CPU CPU
Mode Mode
0, 1 2, 3 Remarks
8EH 8FH
H
L
15
87
0
Byte Count Register
8FH
Channel 0: BCRH
Channel 0
DMA Status Register
90H
Channel 0: DSR Channel 0
8EH
91H
Single-block transfer
mode
Chained-block
transfer mode
BCRH
BCRL
7
6
5
4
3
2
Single-block
transfer mode
Chained-block
EOT
—
—
—
——
transfer mode
EOM BOF COF
1
0
DE DWE
Read/Write
Initial value
R/W R/W R/W R/W —
0
0
0
0
0
— R/W W
0
0
1
End of transfer
0: Transfer not completed
1: Transfer completed
Counter overflow
• Chained-block
transfer
0: No error detected
1: Error detected
Buffer overflow/underflow
• Chained-block transfer
0: No error detected
1: Error detected
DMA enable
0: Disable
1: ^Enable
DE bit write enable
0: Enable
1: Disable
End of frame transfer
• Chained-block transfer
0: Frame transfer not completed
1: Frame transfer completed
Rev. 0, 07/98, page 435 of 453