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
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