TN231

Rabbit 2000^TM Features
and Their Use in Board-Level Products

New features have been introduced over time into the Rabbit 2000^TM chip, which is used in Z-World and Rabbit Semiconductor single-board computers and RabbitCore modules. The table below lists these features and when they were first introduced, and matches them against the version of Dynamic C where software support became available.

Rabbit 2000TM Features/Revisions	Dynamic C Version First Available in	Chip Revision First Available in	Notes
Spectrum Spreader	7.32 Premier	2000B (IQ4T)	Enabled by default for 2000B and later chips, except for BL1800
External Interrupt Fix1	7.25	2000A (IQ3T)	Use SetVectExtern3000, GetVectExtern3000 functions
Separate Instruction and Data Space	7.30	2000A (IQ3T)	Do not use before DC 7.30 under any circumstances
Early I/O Enable	7.32	2000C (IQ5T)	Enabled by default if spectrum spreader is on
Long Stop Bit	7.32 Premier	2000A (IQ3T)

1 See Technical Note TN301, Rabbit 2000TM Microprocessor Interrupt Problem, for more information if you have an original Rabbit 2000 chip (marked IQ2T).

For example, the spectrum spreader was added to revision B of the Rabbit 2000^TM chip, and support for the spectrum spreader first appeared in Dynamic C 7.32 Premier, which was released late in 2002. Using the spectrum spreader mitigates radiated emissions, and the spectrum spreader is now enabled by default for all boards with revision B and later of the Rabbit 2000^TM chip, except the BL1800 where the spectrum spreader should remain turned off. The spectrum spreader may also be turned off on other boards through a simple change so that the following BIOS line reads #define ENABLE_SPREADER 0.

#define ENABLE_SPREADER 1  // Set to 0 to disable spectrum spreader
                           // 1 to enable normal spreading, or
                           // 2 to enable strong spreading.

NOTE	The strong spreading setting is not needed for Z-World and Rabbit Semiconductor board-level products.

Refer to the Rabbit 2000 Microprocessors User's Manual and to the Dynamic C Premier User's Manual for more information on these enhancements and their use.

Z-World and Rabbit Semiconductor
Products Using the Rabbit 2000^TM Chip

Product	Spectrum Spreader
All products shipped prior to November, 2002	OFF
Products shipped after November, 2002, with IQ5T Rabbit 2000 chip and Dynamic C 7.32 or later
RCM2000 Series RCM2100 Series RCM2200 Series RCM2300 Series	ON
BL1800	OFF
BL1810, BL1820	ON
BL2000 Series BL2100 Series OP6600, OP6700, TCP/IP Development Kit OP6800 Series OP7200 Series EG2100	ON