HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 30

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

1.6.5
Register
Name
Current
descriptor
address
register H
Error
descriptor
address
register L
Error
descriptor
address
register H
Receive
buffer length
L*
Receive
buffer length
H*
Byte count
register L
Byte count
register H
DMA status
register*
DMA mode
register
End-of-frame
interrupt
counter
DMA interrupt
enable
register
DMA
command
register
Notes: 1. Some bits in the DMA status register are cleared by writing 1 to their bit positions, and
Rev. 0, 07/98, page 14 of 453
2
2
1
2. These registers are used in receiving, so they are not provided for channels 1 and 3.
DMA Registers Provided Separately for Channels 0 to 3 (cont)
Symbol
CDAH
EDAL
EDAH
BFLL
BFLH
BCRL
BCRH
DSR
DMR
FCT
DIR
DCR
one is a write-only bit. See section 6.2.7, DMA Status Register, for details.
Chan-
nel 0
89H
8AH
8BH
8CH
8DH
8EH
8FH
90H
91H
93H
94H
95H
CPU Modes 0 & 1
Chan-
nel 1
A9H
AAH
ABH
AEH
AFH
B0H
B1H
B3H
B4H
B5H
Chan-
nel 2
C9H
CAH
CBH
CCH
CDH
CEH
CFH
D0H
D1H
D3H
D4H
D5H
Chan-
nel 3
E9H
EAH
EBH
EEH
EFH
F0H
F1H
F3H
F4H
F5H
Address
Chan-
nel 0
88H
8BH
8AH
8DH
8CH
8FH
8EH
91H
90H
92H
95H
94H
CPU Modes 2 & 3
Chan-
nel 1
A8H
ABH
AAH
AFH
AEH
B1H
B0H
B2H
B5H
B4H
Chan-
nel 2
C8H
CBH
CAH
CDH
CCH
CFH
CEH
D1H
D0H
D2H
D5H
D4H
Chan-
nel 3
E8H
EBH
EAH
EFH
EEH
F1H
F0H
F2H
F5H
F4H
MSB
0
0
0
0
0
0
0
0
Hardware Reset
0
0
0
0
Initial Value at
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
( : undefined)
LSB
1
0
0
0
Read/
Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R/W
W