3. Interfaces and external signals

  • 2x 100-pin fine-pitch low-profile Connectors (Hirose FX8)

  • Ethernet 10/100 Mbit MAC

  • Dual USB 2.0 Full Speed (12 MBit/s) Hosts

  • USB 2.0 Full Speed (12 MBit/s) Device

  • Six USARTs

  • One UART

  • One Synchronous Serial Controller (SSC, I2S)

  • Two Serial Peripheral Interfaces (SPI)

  • One Two Wire Interface (TWI, I2C)

  • Two MultiMedia Card Interfaces

  • JTAG debug port

  • Digital Ports - up to 80 available

  • Control Signals: IRQs, BMS, SHDN, WKUP

  • 4 Programmable Clocks

  • External RTC (optional)

  • Image Sensor Interface

  • Analog-to-Digital Converter

  • 16-Bit parallel CPU-Bus

Some of the various functions are realized by multiplexing connector pins; therefore not all functions may be used at the same time (see Appendix D, Stamp9G20 Pin Assignment)).