Rita-51 is a six-layer board with separate VCC and
Ground planes intended for Internet and intranet applications.
- Uses any 8051 in the TQFP package
- 128K of SRAM
- 128K 5-volt FLASH ROM
- 1 full-duplex serial port on board (2 with
- 12 general purpose digital input / output
- Demultiplexed processor Address and Data
- All system signals are available on a
- Prototyping area for additional circuitry
- Shielded RJ-45 connector with LAN and LINK
- Board operates on +5 volts
- Power supplied to the board by way of a 2
position terminal block
- Power on LED
- Operating temperature 0 to 70C, extended
- Machine screw sockets under all
- 6 layer 3" x 4" board
- Mounting holes in corners
The board may
be populated with a wide range of high-speed 8051 microcontrollers in the
44-pin TQFP package. The board uses the CS8900A Ethernet driver to
directly connect to a 10Base-T network through a shielded RJ-45 socket.
The MCS-51 / CS8900A combination takes advantage of readily available hardware
and software tools as well as the wealth of publicly available applications
A new textbook from Rigel Press, "Networking Eight-Bit
Microcontrollers, Fundamentals and Applications with the 8051" uses
the Rita-51J board to explain the basics of using microcontrollers on the
The Rita-51 has has circuitry to support two RS232 serial ports. All 8051
microcontrollers have at least one on-chip UART. Microcontrollers (e.g.
DS87C520 or DS89C420) with two serial ports may use both channels. The board
comes with 128K RAM and 128K 5-volt FLASH ROM. The Rita-51 uses a CPLD
(complex programmable logic device) to implement a variety of memory schemes,
including Rigel's RROS and RRM architectures.
Rita-51's small size makes it suitable for OEM applications. It contains
large memory to facilitate embedded TCP/IP applications. The on-board
FLASH ROM may be programmed directly from Reads51. A stand-alone software
utility to program is also available from our website. Despite its high
performance the RITA-51 is a low cost board with a prototyping area, 4 user's
buttons and 4 indicators, which makes it an ideal platform for students and
Rita-51 User's Manual
Developing applications so
the Rita-51 can run on the Internet.
and debug the application program that will reside on the Rita-51 using Rigel
Corporation’s development tool Reads51.
A royalty-free library of network drivers and
utility support functions, NetApi51 is given to
be used with Reads51 (see example).
(Alternatively, you may use any
public domain or third-party software development tools, and TCP/IP
- Download your program the to Rita-51 FLASH
using the Reads51 Software.
- Use the RitaBrowser
(example) to talk to your Rita-51 on the internet.
Reads51 is an integrated applications software
development system, which runs on an IBM PC or compatible host. Reads51 allows
writing, compiling, assembling, debugging, downloading, and running
applications software in the MCS-51 language. Reads51 contains a C compiler,
relative assembler, linker/locator, editor, chip simulator, assembly
language debugger, and host-to-board communications in a user-friendly,
RitaBrowser monitors and controls
Internet appliances built with Rigel Corporation's RITA family of control
boards. The RITA nodes may be on
the Internet or on a private network such as a personal network or a company
our products includes a review of the software and hardware, sample
programs. All of our documentation (except circuit diagrams) is
available on the web.
A well-regulated 5-volt (±5% @500mA) power
supply, a serial cable, and a RJ45 cable are to be provided by the user.
We offer two standard options. The
Rita-51 with a generic 87C52 / 89C52 operating at 24MHz, or the RITA-51 with
the DS87C520 operating at 33MHz.
We can populate the board with a wide variety of processors so if you are
looking for a different processor or crystal frequency please let us know.
Schools, Students (with valid school ID), and US military
personal receive a 10% discount on all products.