Z80185 Datasheet, PDF (45/95 Pages) Zilog, Inc. – SMART PERIPHERAL CONTROLLERS

Zilog
DMA REGISTERS
SAR0L
Read/Write
SA7
Addr 20H
SA0
PRELIMINARY
Z80185/Z80195
SMART PERIPHERAL CONTROLLES
DAR0L
Read/Write
DA7
Addr 23H
DA0
SAR0H
Read/Write
SA15
Addr 21H
SA8
DAR0H
Read/Write
DA15
Addr 24H
DA8
SAR0B
Read/Write
Addr 22H
SA19 SA16
- ---
Bits 0-3 are used for SAR0B
SM1-0 SAR18-16 Source
11
000
ext (TOUT/DREQ)
11
001
ASCI0 Rx
11
010
ASCI1 Rx
11
011
ESCC Rx
11
111
PIA27-20 IN
Figure 47. DMA 0 Source Address Registers
DAR0B
Read/Write
Addr 25H
DA19 DA16
- ---
Bits 0-3 are used for DAR0B
DM1-0 DAR18-16 Destination
11
000
ext (TOUT/DREQ)
11
001
ASCI0 Tx
11
010
ASCI1 Tx
11
011
ESCC Tx
11
111
PIA27-20 OUT
Figure 48. DMA 0 Destination Address Registers
DS971850301
45