4. Portux Extension Bus (PXB)

  • 1 Synchronous Serial Controller (SSC, I2S)

  • 1 Serial Peripheral Interface (SPI)

  • 1 Two Wire Interface (TWI, I2C)

  • 1 MultiMedia Card Interfaces

  • 5 USARTS

  • Digital Ports - up to 64 available

  • 4 Programmable Clocks

  • 4-channel 10-bit ADC

  • 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, PortuxG20 Pin Assignment)). The 16-Bit Bus on PXB is buffered and 5V-compatible. Levels are 3.3 V.