Z80189 Datasheet, PDF (54/107 Pages) Zilog, Inc. – GENERAL-PURPOSE EMBEDDED CONTROLLERS

Zilog
DMA REGISTERS
SAR0L
Read/Write
SA7
Addr 20H
SA0
PRELIMINARY
Z80189/Z8L189
GENERAL-PURPOSE EMBEDDED CONTROLLERS
BCR0L
Read/Write
BC7
Addr 26H
BC0
SAR0H
Read/Write
SA15
Addr 21H
SA8
SAR0B
Read/Write
Addr 22H
SA19 SA16
- ---
Bits 0-2 (3) are used for SAR0B
A19, A18, A17, A16 DMA Transfer Request
xx
xx
xx
xx
0 0 ext (CKA0//DREQ0
0 1 ASCI0 Rx
1 0 ASCI1 Rx
1 1 ext (/DREQ1)
Figure 58. DMA 0 Source Address Registers
DAR0L
Read/Write
DA7
Addr 23H
DA0
DAR0H
Read/Write
DA15
Addr 24H
DA8
BCR0H
Read/Write
BC15
Addr 27H
BC8
Figure 60. DMA 0 Byte Counter Registers
MAR1L
Read/Write
MA7
Addr 28H
MA0
MAR1H
Read/Write
MA15
Addr 29H
MA8
MAR1B
Read/Write
Addr 2AH
MA19 MA16
----
Figure 61. DMA 1 Memory Address Registers
DAR0B
Read/Write
Addr 25H
DA19 DA16
- - --
Bits 0-2 (3) are used for DAR0B
A19, A18, A17, A16 DMA Transfer Request
x x 0 0 ext (CKA0//DREQ0)
x x 0 1 ASCI0 Tx
x x 1 0 ASCI1 Tx
x x 1 1 ext (/DREQ1)
Figure 59. DMA 0 Destination Address Registers
54
DS971890301