BS85C20-3 参数 Datasheet PDF下载

Contents

Special Function Register Description ...........................................23

Indirect Addressing Registers

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IAR0, IAR1..........................................................23

Memory Pointers

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MP0, MP1 ..............................................................................23

Bank Pointer

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BP ................................................................................................25

Accumulator

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ACC ..............................................................................................26

Program Counter Low Register

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PCL..................................................................26

Look-up Table Registers

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TBLP, TBHP, TBLH.....................................................26

Status Register

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STATUS ...................................................................................26

EEPROM Data Memory .....................................................................28

EEPROM Data Memory Structure ........................................................................28

Reading Data from the EEPROM .........................................................................30

Writing Data to the EEPROM ...............................................................................30

Write Protection ....................................................................................................30

EEPROM Interrupt ...............................................................................................30

Programming Considerations ...............................................................................31

Programming Examples .......................................................................................31

Oscillator............................................................................................32

Oscillator Overview...............................................................................................32

System Clock Configurations................................................................................32

Internal High Speed RC Oscillator

-

HIRC............................................................32

Internal Low Speed RC Oscillator

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LIRC .............................................................33

Operating Modes and System Clocks .............................................34

System Clocks......................................................................................................34

Control Register ...................................................................................................35

System Operation Modes .....................................................................................36

Operating Mode Switching....................................................................................37

NORMAL Mode to SLOW Mode Switching...........................................................38

SLOW Mode to NORMAL Mode Switching...........................................................38

Entering the SLEEP Mode....................................................................................38

Entering the IDLE0 Mode .....................................................................................39

Entering the IDLE1 Mode .....................................................................................39

Standby Current Considerations...........................................................................39

Wake-up...............................................................................................................40

Programming Considerations ...............................................................................40

Watchdog Timer ................................................................................41

Watchdog Timer Clock Source .............................................................................41

Watchdog Timer Control Register.........................................................................41

Watchdog Timer Operation...................................................................................42

Reset and Initialisation .....................................................................43

Reset Functions ...................................................................................................43

Reset Initial Conditions .........................................................................................44

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