The NM1234 series can run up to 48(72) MHz and operate at 2.2V(3.3V) ~ 5.5V, -40℃ ~ 105℃, and thus can support a variety of industrial control applications which need high performance. The NM1234 offers 64 Kbytes embedded program Flash, size configurable Data Flash (shared with program Flash), 7.5 Kbytes Flash for the ISP, 1.5 Kbytes SPROM for security and 16 Kbytes SRAM.

Many system level peripheral functions, such as I/O Port, Timer, UART, SPI, I²C, PWM, ADC, OP, PGA, Watchdog Timer, Analog Comparator and Brown-out Detector, have been incorporated into the NM1234 to reduce component count, board space and system cost.

Additionally, the NM1234 series is equipped with ISP (In-System Programming) and ICP (In-Circuit Programming) functions, which allow the user to update the program memory without removing the chip from the actual end product.