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NUC123 SERIES DATASHEET NUC123 ARM Cortex -M0 32-bit Microcontroller NuMicro Family NUC123 Series Datasheet The information described in this document is the exclusive intellectual property of Nuvoton Technology Corporation and shall not be reproduced without permission from Nuvoton. Nuvoton is providing this document only for reference purposes of NuMicro microcontroller based system design. Nuvoton assumes no responsibility for errors or omissions. All data and specifications are subject to change without notice. For additional information or questions, please contact: Nuvoton Technology Corporation. www.nuvoton.com May 8, 2020 Page 1 of 100 Rev.2.05 NUC123 SERIES DATASHEET NUC123 TABLE OF CONTENTS 1 GENERAL DESCRIPTION ....................................................................... 8 2 FEATURES ......................................................................................... 9 2.1 NuMicro NUC123 Series Features ................................................................ 9 3 Abbreviations ..................................................................................... 12 4 PARTS INFORMATION LIST AND PIN CONFIGURATION .............................. 14 4.1 NuMicro NUC123 Series Naming Rule .......................................................... 14 4.2 NuMicro NUC123 Series Selection Guide ....................................................... 15 4.2.1 NuMicro NUC123xxxANx Selection Guide .............................................................. 15 4.2.2 NuMicro NUC123xxxAEx Selection Guide .............................................................. 15 4.3 NuMicro NUC123 Series Pin Configuration ..................................................... 16 4.3.1 NuMicro NUC123xxxANx Pin Diagram .................................................................. 16 4.3.2 NuMicro NUC123xxxAEx Pin Diagram .................................................................. 19 4.4 Pin Description ........................................................................................ 22 4.4.1 NuMicro NUC123 Pin Description ........................................................................ 22 5 BLOCK DIAGRAM ............................................................................... 27 5.1 NuMicro NUC123 Block Diagram ................................................................. 27 6 FUNCTIONAL DESCRIPTION ................................................................. 28 6.1 ARM Cortex -M0 Core.............................................................................. 28 6.2 System Manager ...................................................................................... 30 6.2.1 Overview ....................................................................................................... 30 6.2.2 System Reset ................................................................................................. 30 6.2.3 Power modes and Wake-up sources ...................................................................... 36 6.2.4 System Power Distribution .................................................................................. 38 6.2.5 System Memory Map ......................................................................................... 40 6.2.6 System Timer (SysTick) ..................................................................................... 42 6.2.7 Nested Vectored Interrupt Controller (NVIC) ............................................................. 43 6.3 Clock Controller ....................................................................................... 47 6.3.1 Overview ....................................................................................................... 47 6.3.2 System Clock and SysTick Clock .......................................................................... 50 6.3.3 Peripherals Clock ............................................................................................. 50 6.3.4 Power-down Mode Clock .................................................................................... 50 6.3.5 Frequency Divider Output ................................................................................... 51 6.4 Flash Memory Controller (FMC) .................................................................... 52 May 8, 2020 Page 2 of 100 Rev.2.05