PIM517

MS51 SERIES TECHNICAL REFERENCE MANUAL MS51 1T 8051 8-bit Microcontroller NuMicro Family MS51 Series MS51FB9AE MS51XB9AE MS51XB9BE Technical Reference Manual 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 Apr. 08, 2020 Page 1 of 319 Rev 1.03 MS51 SERIES TECHNICAL REFERENCE MANUAL MS51 TABLE OF CONTENTS 1 GENERAL DESCRIPTION .............................................................................. 8 2 FEATURES ...................................................................................................... 9 3 PARTS INFORMATION ................................................................................. 12 3.1 Package Type .............................................................................................................. 12 3.2 MS51 Series Selection Guide.................................................................................... 12 3.3 MS51 Series Selection Code ..................................................................................... 13 4 PIN CONFIGURATION .................................................................................. 14 4.1 MS51 16KB Series Multi Function Pin Diagram ..................................................... 14 4.1.1 TSSOP 20-pin Package Pin Diagram ........................................................................ 14 4.1.2 QFN 20-pin Package Pin Diagram ............................................................................. 15 4.2 MS51 16KB Series Pin Description .......................................................................... 17 5 BLOCK DIAGRAM ......................................................................................... 20 5.1 MS51 16KB Series Block Diagram ........................................................................... 20 6 FUNCTION DESCRIPTION ........................................................................... 21 6.1 Memory Organization.................................................................................................. 21 6.1.1 Program Memory ............................................................................................................ 21 6.1.2 Data Flash ....................................................................................................................... 22 6.1.3 Security Protection Memory (SPROM) ....................................................................... 23 6.1.4 Config Bytes .................................................................................................................... 23 6.1.5 Data Memory ................................................................................................................... 28 6.1.6 Special Function Register (SFR).................................................................................. 30 6.2 System Manager ....................................................................................................... 1 53 6.2.1 Clock System ................................................................................................................ 153 6.2.2 Power Management ..................................................................................................... 158 6.2.3 Power Monitoring And Reset ...................................................................................... 160 6.2.4 Power-On Reset and Low Voltage Reset ................................................................. 160 6.2.5 Brown-Out Detect and Reset ...................................................................................... 160 6.2.6 External Reset and Hard Fault Reset ........................................................................ 161 6.2.7 Watchdog Timer Reset ................................................................................................ 162 6.2.8 Software Reset ............................................................................................................. 163 6.2.9 Boot Select .................................................................................................................... 164 6.2.10 Reset State .................................................................................................................... 165 6.2.11 Interrupt System ........................................................................................................... 165 6.2.12 Enabling Interrupts ....................................................................................................... 166 6.2.13 Interrupt Priorities ......................................................................................................... 167 6.2.14 Interrupt Service ........................................................................................................... 168 6.2.15 Interrupt Latency ........................................................................................................... 169 Apr. 08, 2020 Page 2 of 319 Rev 1.03