As expected from a microcontroller there are numerous communication interfaces offered on LPC1800 microcontrollers. The parts have two high speed USB ports supporting host, device and on-the-go operation – one with an onboard high speed PHY. Some LPC1800 parts also have a 10/100 Ethernet MAC. Because of NXP’s flexible multilayered bus structure, the LPC1800 series are able to run the Ethernet and USB simultaneously without bottlenecks. The LPC1800 series has an LCD controller for TFT and STN panels with resolutions up to 1024x768. The parts also include two CAN 2.0B interfaces for industrial applications. A unique peripheral from NXP is the SPI Flash interface or SPIFI which allows an external serial memory to appear as an internal block of memory within the memory map. The designer can even execute code from this external serial memory. SPIFI is compatible with standard SPI flash memory, but it is also compatible with quad SPI flash memory, which is just the same as standard flash memory except that it has two extra I/O lines, so four bits of data can be fetched at a time allowing higher performance. The LPC1800 series processors have an external memory controller to connect up 32-bits of external parallel memory, an SDIO or SD/MMC memory controller interface and a Quad Encoder Interface, QEI, to support motor control applications. The Quadrature Encoder Interface connects to an external quad encoder wheel to track position, direction of rotation, and velocity. Additionally, the LPC1800 includes four UARTs that support features such as RS-485, 9th-bit address detection, modem control, IrDA, smart card interface and synchronous mode, also known as USART. Other communication peripherals include, two SSP/SPI ports, two Fast Mode Plus I2C, and two I2S audio interfaces.