Data Sheet

NUC123
May 3, 2017 Page 9 of 99 Rev.2.04
NUC123 SERIES DATASHEET
2 FEATURES
NuMicro
®
NUC123 Series Features 2.1
 Core
– ARM
®
Cortex
®
-M0 core runs up to 72 MHz
– One 24-bit system timer
– Supports low power sleep mode
– Single-cycle 32-bit hardware multiplier
– 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
– 36/68 KB Flash for program code
– 4 KB flash for ISP loader
– Supports In-System Program (ISP) application code update
– 512 byte page erase for flash
– Configurable Data Flash address and size for both 36KB and 68KB system
– Supports 2-wire ICP update through SWD/ICE interface
– Supports fast parallel programming mode by external programmer
 SRAM Memory
– 12/20 KB embedded SRAM
– Supports PDMA mode
 PDMA (Peripheral DMA)
– Supports 6 channels PDMA for automatic data transfer between SRAM and
peripherals such as SPI, UART, I
2
S, USB 2.0 FS device, PWM and ADC
– Supports CRC calculation with four common polynomials, CRC-CCITT, CRC-8, CRC-
16 and CRC-32
 Clock Control
– Flexible selection for different applications
– Built-in 22.1184 MHz high speed oscillator (Trimmed to 1%) for system operation, and
low power 10 kHz low speed oscillator for watchdog and wake-up operation
– Supports one PLL, up to 144 MHz, for high performance system operation
– External 4~24 MHz high speed crystal input for precise timing operation
 GPIO
– Four I/O modes:
 Quasi bi-direction
 Push-Pull output
 Open-Drain output
 Input only with high impendence
– TTL/Schmitt trigger input selectable
– I/O pin configured as interrupt source with edge/level setting
– Supports High Driver and High Sink I/O mode
 Timer
– Supports 4 sets of 32-bit timers with 24-bit up-timer and one 8-bit pre-scale counter
– Independent clock source for each timer
– Provides one-shot, periodic, toggle and continuous counting operation modes
– Supports event counting function
 Watchdog/Windowed-Watchdog Timer
– Multiple clock sources