Z80189 Datasheet, PDF (57/107 Pages) Zilog, Inc. – GENERAL-PURPOSE EMBEDDED CONTROLLERS

Zilog
PRELIMINARY
Bit
Upon Reset
R/W
DSTAT
DE1
0
R/W
DE0 /DWE1 /DWE0 DIE1
0
1
1
0
R/W W W R/W
DIE0
0
R/W
Addr 30H
- DIME
10
R
Z80189/Z8L189
GENERAL-PURPOSE EMBEDDED CONTROLLERS
DMA Master Enable
DMA Interrupt Enable 1, 0
DMA Enable Bit Write Enable 1, 0
DMA Enable Ch 1, 0
Figure 65. DMA Status Register
Bit
Upon Reset
R/W
DMODE
-
-
1
1
Addr 31H
DM1 DM0 SM1 SM0 MMOD -
0
0
0
0
0
1
R/W R/W R/W R/W R/W
Memory MODE Select
Ch 0 Source Mode 1, 0
Ch 0 Destination Mode 1, 0
DM1, 0
00
01
10
11
Destination
M
M
M
I/O
Address
DAR0+1
DAR0-1
DAR0 Fixed
DAR0 Fixed
MMOD
0
1
Mode
Cycle Steal Mode
Burst Mode
SM1, 0
00
01
10
11
Source
M
M
M
I/O
Address
SAR0+1
SAR0-1
SAR0 Fixed
SAR0 Fixed
Figure 66. DMA Mode Registers
DS971890301
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