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276 Rabbit 3000 Microprocessor
B.1 Discussion of Fixes and Improvements
Table B-1 lists the bug fixes, improvements, and additions for the various revisions of the
Rabbit 3000.
Table B-1. Summary of Rabbit 3000 Improvements and Fixes
Description
Rabbit
3000
(IL1T/IZ1T)
Rabbit
3000A
(IL2T/IZ2T)
ID Registers for version/revision identification. X X
System/User mode. X
Memory protection scheme. X
Stack protection. X
RAM segment relocation. X
Secondary watchdog timer. X
Multiply-add and multiply-subtract. X
Variants of block move opcodes. X
16-bit internal I/O address space. X
External I/O interface enhancements. X
Expanded low-power capability. X
PWM improvements. X
Quadrature decoder improvements. X
Integrated Schmitt trigger for 32 kHz oscillator input. X
Alternate output port connection for numerous peripherals. X
Port A decode bug fix. X
LDIR/LDDR with wait states bug fix. X
Interrupt after I/O with short /CSx enabled bug fix. X
IrDA bug fix. X