HT66F40 datasheet(3/244 Pages) HOLTEK

3 / 244 page

Special Function Register Description ...........................................32

Indirect Addressing Registers - IAR0, IAR1....................................32

Memory Pointers - MP0, MP1...............................................................................32

Bank Pointer - BP.................................................................................................33

Accumulator - ACC...............................................................................................34

Program Counter Low Register - PCL ..................................................................34

Look-up Table Registers - TBLP, TBHP, TBLH......................................................34

Status Register - STATUS ....................................................................................34

EEPROM Data Memory .....................................................................36

EEPROM Data Memory Structure ........................................................................36

EEPROM Registers..............................................................................................36

Reading Data from the EEPROM .........................................................................38

Writing Data to the EEPROM ...............................................................................38

Write Protection ....................................................................................................39

EEPROM Interrupt ...............................................................................................39

Programming Considerations ...............................................................................39

Oscillator............................................................................................40

Oscillator Overview...............................................................................................40

System Clock Configurations................................................................................40

External Crystal/ Ceramic Oscillator - HXT ...........................................................41

External RC Oscillator - ERC................................................................................41

Internal RC Oscillator - HIRC................................................................................41

External 32.768kHz Crystal Oscillator - LXT .........................................................41

LXT Oscillator Low Power Function ......................................................................42

Internal 32kHz Oscillator - LIRC ...........................................................................42

Supplementary Oscillators....................................................................................42

Operating Modes and System Clocks .............................................43

System Clocks......................................................................................................43

System Operation Modes .....................................................................................44

Control Register ...................................................................................................45

Fast Wake-up .......................................................................................................46

Operating Mode Switching and Wake-up..............................................................47

NORMAL Mode to SLOW Mode Switching...........................................................47

SLOW Mode to NORMAL Mode Switching...........................................................48

Entering the SLEEP0 Mode..................................................................................48

Entering the SLEEP1 Mode..................................................................................49

Entering the IDLE0 Mode .....................................................................................49

Entering the IDLE1 Mode .....................................................................................49

Standby Current Considerations...........................................................................49

Wake-up...............................................................................................................50

Programming Considerations ...............................................................................50

Contents

Rev. 1.60

October 24, 2011

HT66F40 数据表(PDF) 3 Page - Holtek Semiconductor Inc

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