HT45F23 データシートの表示（PDF） - Holtek Semiconductor

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HT45F23

8-Bit Flash MCU with Op Amps & Comparators

Holtek Semiconductor 

Contents

Program Counter Low Register - PCL..................................................................30

Look-up Table Registers - TBLP, TBLH................................................................30

Status Register - STATUS ...................................................................................31

EEPROM Data Memory .....................................................................32

EEPROM Data Memory Structure ........................................................................32

EEPROM Registers..............................................................................................32

Reading Data from the EEPROM .........................................................................33

Writing Data to the EEPROM ...............................................................................33

Write Protection ....................................................................................................34

EEPROM Interrupt ...............................................................................................34

Programming Considerations ...............................................................................34

Programming Examples .......................................................................................34

Oscillator............................................................................................35

Oscillator Overview...............................................................................................35

System Clock Configurations................................................................................35

External Crystal/ Ceramic Oscillator - HXT ..........................................................36

External RC Oscillator - ERC ...............................................................................37

External Oscillator - EC........................................................................................37

Internal RC Oscillator - HIRC ...............................................................................37

External 32.768kHz Crystal Oscillator - LXT ........................................................37

LXT Oscillator Low Power Function ......................................................................38

Internal 32kHz Oscillator - LIRC...........................................................................39

Supplementary Oscillators....................................................................................39

Operating Modes and System Clocks .............................................39

System Clocks......................................................................................................39

System Operation Modes .....................................................................................40

Control Register ...................................................................................................42

Fast Wake-up .......................................................................................................43

Operating Mode Switching and Wake-up..............................................................44

NORMAL Mode to SLOW Mode Switching...........................................................45

SLOW Mode to NORMAL Mode Switching...........................................................46

Entering the SLEEP0 Mode..................................................................................46

Entering the SLEEP1 Mode..................................................................................47

Entering the IDLE0 Mode .....................................................................................47

Entering the IDLE1 Mode .....................................................................................47

Standby Current Considerations...........................................................................48

Wake-up ...............................................................................................................48

Programming Considerations ...............................................................................49

Watchdog Timer ................................................................................49

Watchdog Timer Clock Source .............................................................................49

Watchdog Timer Control Register.........................................................................50

Watchdog Timer Operation...................................................................................50

Rev. 1.20

3

September 15, 2011

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