HD64570 HITACHI [Hitachi Semiconductor], HD64570 Datasheet - Page 261
HD64570
Manufacturer Part Number
HD64570
Description
Serial Communications Adaptor
Manufacturer
HITACHI [Hitachi Semiconductor]
Datasheet
1.HD64570.pdf
(469 pages)
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Chained-Block Transfer Mode: In chained-block transfer mode, these subregisters serve as the
error descriptor address register (EDA: EDAL, EDAH). This register must be initialized to the
low-order 16 bits of the 24-bit starting address of the descriptor that indicates the buffer next to the
last buffer to be written or read. When the value of the current descriptor address register (CDA)
matches that of EDA, chained-block transfer is terminated. The high-order eight bits of the
descriptor are specified by the chain pointer base (CPB).
This register can be written by the MPU even while a DMA is enabled. For writing this register in
byte units, write EDAL first. When EDAH is written, EDAL and EDAH are updated
simultaneously.
After reset, the value of this register is undefined.
Single-block transfer
mode
Chained-block
transfer mode
Figure 6.4 Error Descriptor Address Register
15
Not used
EDAH
H
8 7
Rev. 0, 07/98, page 245 of 453
Not used
EDAL
L
0
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