Z80180/Z8S180/Z8L180
Enhanced Z180 Microprocessor
Zilog
DMA SOURCE ADDRESS REGISTER CHANNEL 0
(SAR0: I/O Address = 20H to 22H) specifies the physical source address for channel 0 transfers. The register contains
20 bits and can specify up to 1024 KB memory addresses or up to 64 KB I/O addresses. Channel 0 source can be mem-
ory, I/O, or memory mapped I/O. For I/O, the MS bits of this register identify the Request Handshake signal.
DMA Source Address Register, Channel 0L
DMA Source Address Register Channel 0B
Mnemonic SAR0L
Mnemonics SAR0B
Address 20
Address 22
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
--
--
--
--
-- --
-- --
--
--
-- --
-- --
--
--
DMA Channel 0 Address
DMA Channel B Address
Figure 55. DMA Source Address Register 0L
Figure 57. DMA Source Address Register 0B
DMA Source Address Register, Channel 0H
Mnemonic SAR0H
Address 21
7
6
5
4
3
2
1
0
--
--
-- --
-- --
--
--
DMA Channel 0 Address
Figure 56. DMA Source Address Register 0H
1-50
P R E L I M I N A R Y
DS971800401
ZILOG [ ZILOG, INC. ]
