The NXP LPC2420FBD208K is a 16/32-bit ARM7-based microcontroller from the LPC2400 series, clocked at 72 MHz. It carries 82K x 8 of on-chip RAM but no internal program memory — it is ROMless, so code lives on an external parallel or SPI NOR Flash accessed through the EBI/EMI interface.
ROMless — plan your external memory
Because the LPC2420FBD208K has no internal Flash, every design must attach external non-volatile memory on the EBI/EMI bus.
Connectivity and I/O — what is on the 208 pins
160 general-purpose I/O lines are multiplexed with the peripheral functions.