Digi ConnectCore System-on-Modules Single Board Computers Development kits

RabbitCore® RCM3700 Series


Microprocessor Core Module

  • Up to 4 serial ports for multiple device connectivity
  • 10Base-T with optional 10/100Base-T Ethernet
  • Up to 512K Flash for code and up to 512K SRAM for data
  • 1 MB of on-board serial Flash utilizing FAT file support

The RabbitCore RCM3700 series extends beyond standard serial to Ethernet devices by providing up to six serial ports along with a rich embedded I/O control feature set such as PWM and Quadrature Decoder Inputs. Additionally, the modules include a backup battery for protected data storage and for the real-time clock.

The software environment for the RCM3700 series offers an excellent platform for developing applications with web server capabilities, especially for remote monitoring and control. With a 1 MB on-board serial Flash, the RCM3700 series can store additional web pages or be used as a datalogger. The RCM3700 easily mounts onto a user-designed motherboard, making it ideal for new and existing applications. With an integrated hardware and software solution, the RCM3700 series ensures your product gets to market faster with lower development costs.

The RCM3700 RabbitCore is the lowest priced Rabbit® 3000 microprocessor based core module designed for Ethernet/Internet applications. The RCM3700 features 512K Flash / 512K SRAM or 256K Flash / 128K SRAM, 4 serial ports, and an extremely small footprint (2.95" × 1.20" / 75 × 30 mm). The RCM3710 is the least expensive of the Ethernet/Internet enabled Rabbit 3000 microprocessor based RabbitCores. Extensive demo programs and software application templates make it easy to get the RCM3700 up and running in record time.

This RabbitCore mounts directly on a user-designed motherboard with a single 0.1" (2.54 mm) 2x20 dual-row IDC header and can interface with all manner of CMOS-compatible digital devices. 33 digital I/O (shared with serial ports), power, and other signals are routed directly to the motherboard. Built-in low — EMI features, including a clock spectrum spreader, practically eliminate EMI problems, helping OEMs pass European CE and other regulatory RF emissions tests.

The RCM3700 is equipped with +5 VDC tolerant I/O, quadrature encoder inputs, PWM outputs, and pulse capture and measurement capabilities. The RCM3700 also features a battery-backable real-time clock, glueless memory and I/O interfacing, and low-power "sleepy" modes. An alternate I/O bus can be configured for 8 data lines and 6 address lines (shared with parallel I/O).

Programmed with Rabbit's Dynamic C® integrated development environment, the RCM3700 executes math, logic, and I/O exceptionally quickly. The Rabbit 3000 microprocessor, RCM3700, and Dynamic C were designed in a complementary fashion for maximum performance and ease of use in embedded systems. Rabbit's industry-proven Dynamic C development system is a C language environment that includes an editor, compiler, and in-circuit debugger. User programs can be compiled, executed, and debugged using Dynamic C and a programming cable-no in-circuit emulator is required. An extensive library of drivers and sample programs is provided, including royalty-free TCP/IP stack with source code.

Key Features

  • Powerful Rabbit 3000 microprocessor
  • Low-profile footprint: 2.95" x 1.20" x 0.88" (75 mm x 30 mm x 22 mm)
  • Up to 512K Flash / 512K SRAM
  • 33 digital I/O, alternate I/O bus
  • Up to 5 serial ports (IrDA, HDLC, asynch, sync, SPI)

Design Advantages

  • Low-cost solution
  • Ready-made platform for fast time-to-market, up to 3 months design integration timesavings.
  • Compact size
  • Dynamic C® development environment for real-time development and debugging
  • Exceptionally fast performance for math, logic, I/O


  • Remote Data Logging
  • OEM Serial to Ethernet products

Designing with RabbitCores

The RabbitCore family of microprocessor core modules is designed to facilitate rapid development and implementation of embedded systems. RabbitCores are powered by high-performance 8-bit Rabbit microprocessors with extensive integrated features and a C-friendly instruction set designed for use with the Dynamic C® development system. The RabbitCore mounts on a user-designed motherboard and acts as the controlling microprocessor for the user's system. Small in size but packed with powerful features, these core modules give designers a complete package for control and communication.

Product Type RCM3700 RCM3710 RCM3720
Microprocessor Low-EMI Rabbit® 3000 at 22 MHz
Ethernet Port 10Base-T interface, RJ-45, 2 LEDs
Flash Memory 512K 256K 512K
SRAM 512K 128K 256K
Serial Flash Memory 1 MB
Backup Battery Connection for user-supplied backup battery (to support RTC and SRAM)
General-Purpose I/O 33 parallel digital I/O lines:
  • 31 configurable I/O
  • 2 fixed outputs
Additional I/O Reset
External I/O Bus Can be configured for 8 data lines and 5 address lines (shared with parallel I/O lines), plus I/O read/write
Serial Ports Four 3.3V CMOS-compatible ports configurable as:
  • 4 asynchronous serial ports (with IrDA) or
  • 3 clocked serial ports (SPI) plus 1 HDLC (with IrDA) or
  • 1 clocked serial port (SPI) plus 2 HDLC serial ports (with IrDA)
Serial Rate Maximum asynchronous baud rate = CLK/8
Slave Interface A slave port allows the RCM3700 series to be used as an intelligent peripheral device slaved to a master processor, which may either be another Rabbit 3000 or any other type of processor
Real-Time Clock Yes
Timers Ten 8-bit timers (6 cascadable, 3 reserved for internal peripherals), one 10-bit timer with 2 match registers
Watchdog/Supervisor Yes
Pulse-Width Modulators 4 PWM output channels with 10-bit free-running counter and priority interrupts
Input Capture/Quadrature Decoder 2-channel input capture can be used to time input signals from various port pins
  • 1 quadrature decoder unit accepts inputs from external incremental encoder modules or
  • 1 quadrature decoder unit shared with 2 PWM channels
Power 4.75–5.25V DC 100 mA @ 22.1 MHz, 5V; 78 mA @ 11.05 MHz, 5V
Operating Temperature 0° C to 70° C
Humidity 5% to 95%, non-condensing
Connectors One 2 x 20, 0.1” pitch
Board Size 1.20” × 2.95” × 0.89” (30 mm × 75 mm × 23 mm)
Product Warranty 1 year

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