MCU selection note — LPC812M101JDH16129
At 30 MHz the Cortex-M0+ executes single-cycle multiply and delivers enough throughput for a PID loop running at a few kHz or a UART stream without bit-banging.

NXP LPC81xM series, LPC812M101JDH16129, 32-bit ARM Cortex-M0+ MCU, 30MHz, 16KB Flash, 4KB RAM, 14 I/O, I²C/SPI/UART, 1.8V–3.6V Vdd, -40°C to 105°C, 16-TSSOP.
| Parameter | Value |
|---|---|
| Series | LPC81xM |
| Mounting | Surface Mount |
| Oscillator type | Internal |
| Program memory type | FLASH |
| Voltage - supply (Vcc (Vdd)) | 1.8V ~ 3.6V |
| Operating temperature | -40°C~105°C(TA) |
| Speed | 30MHz |
| Package | Bulk |
| RAM size | 4K x 8 |
| Core size | 32-Bit Single-Core |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Connectivity | I²C, SPI, UART/USART |
| Number of i (O) | 14 |
| Core processor | ARM® Cortex®-M0+ |
| Case | 16-TSSOP (0.173\", 4.40mm Width) |
| Program memory size | 16KB (16K x 8) |
At 30 MHz the Cortex-M0+ executes single-cycle multiply and delivers enough throughput for a PID loop running at a few kHz or a UART stream without bit-banging.
The core runs at 30 MHz.