Rabbit 6000 User’s Manual
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68
5.4 Register Descriptions
MMU Instruction/Data Register
(MMIDR)
(Address = 0x0010)
Bit(s)
Value
Description
7
0
Internal I/O addresses are decoded using only the lower eight bits of the
internal I/O address bus. This restricts internal I/O addresses to the range
0x0000–0x00FF.
1
Internal I/O addresses are decoded using all 15 bits of the address internal
I/O address bus. This option must be selected to access internal I/O
addresses of 0x0100 and higher.
6
This bit is reserved an must be written with zero.
5
0
Enable A16 and bank select address MSB inversion independent of
instruction/data.
1
Enable A16 and bank select address MSB inversion for data accesses
only. This enables the instruction/data split.
4
0
Normal /CS1 operation.
1
Force /CS1 always active. This will not cause any conflicts as long as the
memory using /CS1 does not also share an output enable or write enable
with another memory.
3
0
Normal operation.
1
For a data segment access, invert bank select address MSB before
MBxCR decision.
2
0
Normal operation.
1
For a data segment access, invert A16
1
0
Normal operation.
1
For a root segment access, invert bank select address MSB before
MBxCR decision.
0
0
Normal operation.
1
For a root segment access, invert A16
Summary of Contents for 6000
Page 1: ...Rabbit 6000 Microprocessor User s Manual 90001108_J...
Page 11: ...Rabbit 6000 User s Manual digi com 11 1 3 Block Diagram Figure 1 1 Rabbit 6000 Block Diagram...
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Page 234: ...Rabbit 6000 User s Manual digi com 234 Figure 22 3 Sample Slow A D Converter Circuit...
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