Zilog Z80180 Manual de usuario Pagina 117

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Z8018x
Family MPU User Manual
102
UM005003-0703
Table 15. Channel 1 Transfer Mode
DIM1 DIM0 Transfer Mode Address Increment/Decrement
00Memory
to I/O MARI +1, IAR1 fixed
01Memory
to I/O MARI -1, IAR1 fixed
10I/O
to Memory IAR1 fixed, MAR1+1
11I/O
to Memory IAR1 fixed, MAR1-1
DMA I/O Address Register Ch. 1 (IAR1B: 2DH) (Z8S180/L180-Class Processor Only)
Bit 76543210
Bit/Field Reserved
R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0
Note: R = Read W = Write X = Indeterminate ? = Not Applicable
Bit
Position Bit/Field R/W Value Description
7R/W
0
1
Alternating Channels
DMA Channels are independent
Toggle between DMA channels for same device
6 R/W Currently selected DMA channel when Bit 7 = 1
5
4 Reserved R/W 0 Reserved. Must be 0.
3R/W0
1
TOUT/DREQ
is DREQ In
TOUT/DREQ
is TOUT Out
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