668-0011 Rabbit Semiconductor, 668-0011 Datasheet - Page 11

• Manufacturer Part Number: 668-0011
• Description: IC MPU RABIT3000A 55.5MHZ128LQFP
• Manufacturer: Rabbit Semiconductor

Specifications of 668-0011

• Rohs Status: RoHS non-compliant
• Processor Type: Rabbit 3000 8-Bit
• Speed: 55.5MHz
• Voltage: 2.5V, 2.7V, 3V, 3.3V
• Mounting Type: Surface Mount
• Package / Case: 128-LQFP
• Features: -
• Other names: 316-1043

1. T
R
3000 P
HE
ABBIT
ROCESSOR
1.1 Introduction
Rabbit Semiconductor was formed expressly to design a better microprocessor for use in
small- and medium-scale single-board computers. The first microprocessors was the Rabbit
2000. Besides the Rabbit 3000, Rabbit 4000 and Rabbit 5000 microprocessors are also
available. Rabbit microprocessor designers have had years of experience using Z80, Z180,
and HD64180 microprocessors in small single-board computers. The Rabbit micropro-
cessors share a similar architecture and a high degree of compatibility with these micro-
processors, but represent a vast improvement.
The Rabbit 3000 is a high-performance microprocessor with low electromagnetic interfer-
ence (EMI), and is designed specifically for embedded control, and communications. The
8-bit Rabbit 3000 outperforms most 16–bit processors without losing the efficiency of an
8–bit architecture. Extensive integrated features and glueless architecture facilitate rapid
hardware design, while a C-friendly instruction set promotes efficient development of
even the most complex applications.
The Rabbit 3000 is fast, running at up to 55.5 MHz, with compact code and support for up
to 6 MB of memory. Operating with a 1.8 V to 3.6 V power supply, the Rabbit 3000 boasts
six serial ports with IrDA, 56+ digital I/O, Quadrature Decoder, PWM outputs, and pulse
capture and measurement capabilities. It also features a battery-backable real-time clock,
glueless memory and I/O interfacing, and ultra-low power modes. Four levels of interrupt
priority allow fast response to real-time events. Its compact instruction set and high clock
speeds give the Rabbit 3000 exceptionally fast math, logic, and I/O performance.
1.2 Features
The Rabbit 3000 has several powerful design features that practically eliminate EMI prob-
lems, which is essential for OEMs who need to pass CE and regulatory radiofrequency
emissions tests. The amplitude of any electromagnetic radiation is reduced by the internal
spectrum spreader, by gated clocks (which prevent unnecessary clocking of unused regis-
ters), and by separate power planes for the processor core and I/O pins (which reduce
noise crosstalk). An external I/O bus can be used by designers to enable separate buses for
I/O and memory or to limit loading the memory bus to reduce EMI and ground bounce
problems when interfacing external peripherals to the processor. The external I/O bus
accomplishes this by duplicating the Rabbit's data bus on Parallel Port A, and uses Parallel
Port B to provide the processor's six or eight least significant address lines for interfacing
with external peripherals.
Chapter 1 The Rabbit 3000 Processor
1