Data Sheet

NUC123
May 3, 2017 Page 2 of 99 Rev.2.04
NUC123 SERIES DATASHEET
TABLE OF CONTENTS
List of Figures .............................................................................................. 6
List of Tables ............................................................................................... 7
1 GENERAL DESCRIPTION ....................................................................... 8
2 FEATURES ......................................................................................... 9
NuMicro
®
NUC123 Series Features ................................................................ 9 2.1
3 Abbreviations ..................................................................................... 12
4 PARTS INFORMATION LIST AND PIN CONFIGURATION .............................. 14
NuMicro
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NUC123 Series Naming Rule .......................................................... 14 4.1
NuMicro
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NUC123 Series Selection Guide ....................................................... 15 4.2
4.2.1 NuMicro
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NUC123xxxANx Selection Guide .............................................................. 15
4.2.2 NuMicro
®
NUC123xxxAEx Selection Guide .............................................................. 15
NuMicro
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NUC123 Series Pin Configuration ..................................................... 16 4.3
4.3.1 NuMicro
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NUC123xxxANx Pin Diagram .................................................................. 16
4.3.2 NuMicro
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NUC123xxxAEx Pin Diagram .................................................................. 19
Pin Description ........................................................................................ 22 4.4
4.4.1 NuMicro
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NUC123 Pin Description ........................................................................ 22
5 BLOCK DIAGRAM ............................................................................... 27
NuMicro
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NUC123 Block Diagram ................................................................. 27 5.1
6 FUNCTIONAL DESCRIPTION ................................................................. 28
ARM
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Cortex
®
-M0 Core .............................................................................. 28 6.1
System Manager ...................................................................................... 30 6.2
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 .................................................................................. 39
6.2.5 System Memory Map ......................................................................................... 40
6.2.6 System Timer (SysTick) ..................................................................................... 42
6.2.7 Nested Vectored Interrupt Controller (NVIC) ............................................................. 43
Clock Controller ....................................................................................... 47 6.3
6.3.1 Overview ....................................................................................................... 47
6.3.2 System Clock and SysTick Clock .......................................................................... 50
6.3.3 Peripherals Clock ............................................................................................. 50