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Rabbit 6000 User’s Manual
digi.com
357
I/O Bank x Control Register
(IB0CR)
(Address = 0x0080 or 0x0450)
(IB1CR)
(Address = 0x0081 or 0x0451)
(IB2CR)
(Address = 0x0082 or 0x0452)
(IB3CR)
(Address = 0x0083 or 0x0453)
(IB4CR)
(Address = 0x0084 or 0x0454)
(IB5CR)
(Address = 0x0085 or 0x0455)
(IB6CR)
(Address = 0x0086 or 0x0456)
(IB7CR)
(Address = 0x0087 or 0x0457)
Bit(s)
Value
Description
7:6
00
Fifteen wait states for accesses in this bank.
01
Seven wait states for accesses in this bank.
10
Three wait states for accesses in this bank.
11
One wait state for accesses in this bank.
5:4
00
The I signal is an I/O chip select.
01
The I signal is an I/O read strobe.
10
The I signal is an I/O write strobe.
11
The I signal is an I/O data (read or write) strobe.
3
0
Writes are not allowed to this bank. Transactions are normal in every
other way; only the write strobe is inhibited.
1
Writes are allowed to this bank.
2
0
Active-low I signal.
1
Inverted (active-high) I signal.
1
0
Normal I/O transaction timing.
1
Shorten read strobe by one clock cycle and write strobe by one-half clock
cycle. Transaction length remains the same. This guarantees one clock
cycle hold time for both address and data for I/O transactions.
0
0
Use I/O bus if enabled in SPCR.
1
Always use memory data bus.
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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...