HD64570 Datasheet, PDF (455/469 Pages) Hitachi Semiconductor – Serial Communications Adaptor

Address
Register
CPU CPU
Mode Mode
0, 1 2, 3 Remarks
DMAC (Channel 1)
Current Descriptor
A8H A9H
Address Register Channel
1: CDAL Channel 1
H
L
15
87
0
Current Descriptor
A9H A8H
Address Register Channel
1: CDAH Channel 1
Error Descriptor Address AAH
Register Channel 1: EDAL
Channel 1
ABH
Single-block transfer
mode
Chained-block
transfer mode
Not used
CDAH
Not used
CDAL
H
L
15
87
0
Error Descriptor Address ABH
Register Channel 1: EDAH
Channel 1
AAH
Not used
Not used
Byte Count Register
Channel 1: BCRL
Channel 1
ACH ADH
ADH ACH
AEH AFH
Byte Count Register
Channel 1: BCRH
Channel 1
AFH AEH
Single-block transfer
mode
Chained-block
transfer mode
Not used
EDAH
Not used
EDAL
H
L
15
87
0
Single-block transfer
mode
Chained-block
transfer mode
BCRH
BCRL
Rev. 0, 07/98, page 439 of 453