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Rabbit 6000 User’s Manual
digi.com
271
DMA Timed Request Divider High Register
(DTRDHR)
(Address = 0x0117)
Bit(s)
Value
Description
7:0
Write
The eight MSBs of the limit value for the DMA timed request timer are
stored.
DMA Cycle-Steal Timing Control Register
(DCSTCR)
(Address = 0x0125)
Bit(s)
Value
Description
7:6
0x
Fixed cycle-steal DMA channel priority. Higher channel number has
higher priority.
10
Rotating cycle-steal DMA channel priority. Priority rotates highest
channel number to lowest channel number, after every transfer.
11
Rotating cycle-steal DMA channel priority. Priority rotates highest
channel number to lowest channel number, after the current channel
request is serviced.
5:3
000
Maximum one transfer per burst.
001
Maximum two transfers per burst.
010
Maximum three transfers per burst.
011
Maximum four transfers per burst.
100
Maximum eight transfers per burst.
101
Maximum sixteen transfers per burst.
110
Maximum thirty-two transfers per burst.
111
Maximum sixty-four transfers per burst.
2:0
These bits are reserved and should be written with zeros.
Содержание 6000
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Страница 234: ...Rabbit 6000 User s Manual digi com 234 Figure 22 3 Sample Slow A D Converter Circuit...
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Страница 420: ...Rabbit 6000 User s Manual digi com 420 Figure 37 1 Memory Read and Write Cycles...