The LPC4312JBD144 is Dual-core Cortex-M4/M0 MCU with 512 kB flash and 136 kB SRAM, Ethernet, two HS USB, LCD, EMC and is offered in LQFP144 package.
The LPC4300 series microcontrollers bring us a revolutionary new asymmetrical dual-core architecture with ARM® Cortex™-M4 and Cortex™-M0 processors.
The pack installer of the Keil MDK software confirms (since 2023) that the device support for the NXP LPC4300 is depreciated; see: What is the reason? Answer.