User’s Manual
203
B.2 Discussion of Fixes and Improvements
Table B-1 lists bug fixes, improvements, and additions for the various revisions of the
Rabbit 2000.
Table B-1. Summary of Rabbit 2000 Fixes and Improvements
Description
Rabbit
2000
(IQ2T)
Rabbit
2000A
(IQ3T)
Rabbit
2000B
(IQ4T)
Rabbit
2000C
(IQ5T)
ID Registers for version/revision identification.
X
X
X
X
Added Long Stop Register for asynch 9-bit operation.
X
X
X
Added clocked serial command for full-duplex operation.
X
X
X
Improved battery-backup hardware.
X
X
X
Added support for Instruction/Data split.
X
X
X
Implemented write inhibit (/WE0) after reset.
X
X
X
Chip selects inactive during internal I/O.
X
X
X
Corrected external interrupt input bug.
X
X
X
Corrected IOI/IOE prefix bug.
X
X
X
Corrected DDCB/FDCB instruction bug.
X
X
X
Corrected wait-state bug.
X
X
X
Corrected LDIR/LDDR Instruction/Data split bug.
X
X
Added clock spectrum spreader module.
X
X
Added early I/O enable feature.
X
Summary of Contents for 2000
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