Dual-core architecture — M4 for application, M0 for I/O housekeeping
The NXP LPC4367JET256551 pairs an ARM Cortex-M4 running at 204 MHz with a Cortex-M0 coprocessor on the same die. The M4 handles the main application stack, DSP math, and protocol processing; the M0 offloads real-time I/O tasks, peripheral management, and low-level interrupt service. This split keeps the M4 free for control-loop and communications work without context-switch overhead from the CAN or Ethernet interrupt load. Memory resources are sized for mid-complexity firmware: 1 MB Flash for the program image, 154 KB SRAM for data and stack, and a separate 16 KB EEPROM block for configuration parameters that need byte-level endurance. The 164 general-purpose I/O lines support parallel LCD interfaces, external bus expansion via the EBI/EMI controller, or dense sensor arrays on a single PCB.
Supply range is 2.4 V to 3.6 V. Housed in a 256-ball LBGA package (17×17 mm body), the footprint demands a multi-layer PCB with via-in-pad or microvia routing for the fine-pitch balls. Plan for four to six signal layers to route the 164 I/O and the Ethernet differential pairs cleanly.
NXP lists the LPC4367JET256551 as Active.