STC89C53RC datasheet(2/165 Pages) STC

2 / 165 page

CONTENTS

Chapter 1 Introduction...................................................................... 4

1.1 Features................................................................................................. 4

1.2 Block diagram ...................................................................................... 5

1.3 Pin Configurations .............................................................................. 6

1.4 Pin Descriptions ................................................................................... 7

1.5 Pin Package Drawings ......................................................................... 8

Chapter 2 POWER MANAGENMENT, RESET ........................ 11

2.1 Power Management .......................................................................... 11

2.1.1 Idle Mode.....................................................................................................11

2.1.2 Power Down (PD) Mode ............................................................................12

2.2 RESET Control .................................................................................. 16

2.2.1 Reset pin ......................................................................................................16

2.2.2 Power-On Reset (POR).............................................................................. 17

2.2.3 Watch-Dog-Timer.......................................................................................17

2.2.4 Software RESET.........................................................................................20

2.2.5 MAX810 power-on-reset delay..................................................................20

Chapter 3 Memory Organization ................................................... 21

3.1 Program Memory............................................................................... 21

3.2 Data Memory...................................................................................... 22

3.2.1 On-chip Scratch-Pad RAM .......................................................................22

3.2.2 Auxiliary RAM ...........................................................................................22

3.2.3 External RAM.............................................................................................22

3.2.4 Special Function Register for RAM..........................................................23

Chapter 4 Configurable I/O Ports Configurations............................ 29

4.1 Quasi-bidirectional I/O....................................................................... 29

4.2 Push-pull Output................................................................................. 30

4.3 Input-only Mode ................................................................................. 30

4.4 Open-drain Output ............................................................................. 30

Chapter 5 Instruction System ......................................................... 31

5.1 Special Function Registers ................................................................ 31

5.2 Addressing Modes .............................................................................. 36

5.3 Instruction Set Summary .................................................................. 37

5.4 Instruction Definitions....................................................................... 41

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