ARM7 MCU for deterministic control, 144-TFBGA
The LPC2220FET144/G518 is a 16/32-bit ARM7 MCU from NXP's LPC2200 series, clocked at 75 MHz with 64K x 8 of on-chip RAM. It is ROMless, meaning program memory must be provided externally via the EBI/EMI interface — a design choice that lets you size Flash or SRAM to the application rather than being locked into a fixed on-chip density. The 76 general-purpose I/O lines and peripheral set including POR, PWM, WDT, plus connectivity options (I²C, SPI, SSI, SSP, UART/USART, Microwire) make it suited for industrial control panels, motor drives, and telecom infrastructure where an external memory bus is already part of the bill.
The 75 MHz core speed on an ARM7 delivers deterministic throughput for control loops and protocol handling.
ROMless architecture — plan for external memory
The LPC2220 has no internal program memory; external NOR Flash or SRAM is required on the EBI/EMI bus. The 64K x 8 on-chip RAM handles stack and data buffers.