Nuvoton NUC123LD4AN0

The Nuvoton NUC123LD4AN0 is a Core - ARM Cortex-M0 core runs up to 72 MHz - One 24-bit system timer - Supports low power sleep mode - NVIC for the 32 interrupt inputs, each with 4-levels of priority - Supports Serial Wire Debug with 2 watchpoints/4 breakpoints Built-in LDO for wide operating voltage ranges from 2.5 V to 5.5 V Flash Memory - 36K/68K bytes Flash for program code - 4KB flash for ISP loader - Supports In-system program (ISP) application code update SRAM Memory - 12K/20K bytes embedded SRAM PDMA (Peripheral DMA) - Supports 6 channels Clock Control - Flexible selection for different applications - Built-in 22.1184 MHz high speed oscillator for system operation - low power 10 kHz low speed oscillator for watchdog and wake-up operation - Supports 1 PLL, up to 144 MHz, for high performance system operation - External 4~24 MHz high speed crystal input for precise timing operation GPIO - 4 I/O modes (Quasi bi-direction, Push-Pull output, Open-Drain output, Input only with high impendence) Timer - Supports 4 sets of 32-bit timers with 24-bit up-timer and 8-bit pre-scale counter Watchdog/Windowed-Watchdog Timer - 8 selectable time out periods - Wake-up from Power-down or Idle mode PWM/Capture - Up to 2 16-bit PWM generators - Up to 4 16-bit digital Capture timers UART - Up to 2 UART controllers - Supports IrDA (SIR) function - Supports RS-485 9-bit mode and direction control SPI - Up to three sets of SPI controller - Master up to 32 MHz, and Slave up to 16 MHz I2C - Up to 2 sets of I2C device I2S - Interface with external audio CODEC - Capable of handling 8-, 16-, 24- and 32-bit word sizes PS/2 Device Controller - Host communication inhibit and request to send detection - Reception frame error detection USB 2.0 FS Device - 1 set of USB 2.0 FS Device 12Mbps - On-chip USB Transceiver ADC - 10-bit SAR ADC with 150K SPS Brown-out detector - With 4 levels: 4.4 V/3.7 V/2.7 V/2.2 V.