CONTENTS
Chapter 1. Introduction................................................................6
1.1 Features ..................................................................................................6
1.2 Block diagram ........................................................................................7
1.3 Pin Configurations of STC90C51RC/RD+ series MCU........................8
1.4 STC90C51RC/RD+ series Selection Table............................................9
1.5 STC90C51RC/RD+ series Minimum Application System ..................10
1.6 STC90C51RC/RD+ series Application Circuit for ISP........................11
1.7 Pin Descriptions ...................................................................................13
1.8 Package Dimension Drawings..............................................................15
1.9 STC90C51RC/RD+ series MCU naming rules....................................19
1.10 Reduce the Electromagnetic Radiation of MCU Clock (EMI) ..........20
— Three Measures
20
..................................................................................................
1.11 Super Low Power Consumption — STC90Cxx Series MCU............21
Chapter 2. Power Management and Reset ...............................22
..................................................................22
2.1.1 Idle Mode.............................................................................................................23
2.1 Power Management Modes
2.1.2 Stop / Power Down (PD) Mode...........................................................................24
2.2 RESET Sources ....................................................................................30
2.2.1 Reset pin ..............................................................................................................30
2.2.2 Software RESET..................................................................................................30
2.2.3 Power-On Reset (POR)........................................................................................31
2.2.4 Watch-Dog-Timer................................................................................................31
2.2.5 Warm Boot and Cold Boot Reset.........................................................................35
Chapter 3. Memory Organization.............................................36
3.1 Program Memory .................................................................................36
3.2 Data Memory........................................................................................37
3.2.1 On-chip Scratch-Pad RAM..................................................................................37
3.2.2 Auxiliary RAM....................................................................................................39
3.2.3 External Expandable 64KB RAM (Off-Chip RAM)...........................................46
3.3 Special Function Registers ...................................................................47
3.3.1 Special Function Registers Address Map ............................................................47
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