20-668-0003 Rabbit Semiconductor, 20-668-0003 Datasheet - Page 171

• Manufacturer Part Number: 20-668-0003
• Description: IC CPU RABBIT2000 30MHZ 100PQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 20-668-0003

• Processor Type: Rabbit 2000 8-Bit
• Speed: 30MHz
• Voltage: 2.7V, 3V, 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 100-MQFP, 100-PQFP
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 30 MHz
• Operating Supply Voltage: 0 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 40
• Number Of Timers: 8 & 10 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 20-668-0003; 316-1062

When a program is compiled by Dynamic C for a Rabbit target, the Virtual Driver is auto-
matically incorporated into the program. Virtual Driver is the name given to some initial-
ization routines and a group of services performed by the periodic interrupt. The Rabbit
BIOS, software that handles startup, shutdown and various basic features of the Rabbit, is
compiled to the target along with the application program.
Rabbit Semiconductor provides the full source code for the BIOS and Virtual Driver so
the user can modify them and examine details of the operation that are not apparent from
the documentation.
More details on the BIOS and Virtual Driver software can be found in the Dynamic C
User’s Manual, the Rabbit 2000 Designer’s Handbook and the source code in the
Dynamic C libraries.
16.1 The BIOS
The BIOS provided with Dynamic C will work with all Rabbit board products.
The BIOS is compiled separately from the user’s application. It occupies space at the bot-
tom of the root code segment. When execution of the user’s program starts at address zero
on power-up or reset, it starts in the BIOS. When Dynamic C cold-boots the target and
downloads the binary image of the BIOS, the BIOS symbol table is retained to make its
entry points and global data available to the user application. Board specific drivers are
compiled with the user’s program after the BIOS is compiled.
16.1.1 BIOS Services
The BIOS includes support for the following services.
• System startup: including setup of memory, wait states and clock speed.
• Writing to flash. Writes to the primary code memory require turning off interrupts for
• Run-time exception handling and logging to handle fatal errors and watchdog time-outs
• Debugging and PC-target communication
Chapter 16 Rabbit BIOS and Virtual Driver
up to 20 ms or so. To protect the System Identification Block (see the Rabbit 2000
Designer’s Handbook for more information on the System ID Block), the flash driver
will not write to that block. A routine that can actually write this block is not included
in the BIOS to make it hard to accidently corrupt this block.
(error logging not implemented in older versions).
16. R
ABBIT
BIOS
AND
V
IRTUAL
D
RIVER
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