HT66F25D datasheet(3/177 Pages) HOLTEK

3 / 177 page

A/D Flash Type 8-bit MCU with EEPROM

HT66F24D/HT66F25D

Rev. 1.00

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Rev. 1.00

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

EEPROM Data Memor� Str�ct�re ........................................................................................ 3�

EEPROM Registers .............................................................................................................. 3�

Reading Data from the EEPROM ......................................................................................... 34

Writing Data to the EEPROM................................................................................................ 34

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

EEPROM Interr�pt ................................................................................................................ 34

Programming Considerations................................................................................................ 35

Oscillator ........................................................................................................ 36

Osci��ator Overview ............................................................................................................... 3�

System Clock Configurations................................................................................................ 3�

Externa� Cr�sta�/Ceramic Osci��ator – HXT ........................................................................... 37

Interna� High Speed RC Osci��ator – HIRC ........................................................................... 38

Interna� 3�kHz Osci��ator – LIRC........................................................................................... 38

Externa� 3�.7�8kHz Cr�sta� Osci��ator – LXT........................................................................ 38

S�pp�ementar� Osci��ator...................................................................................................... 39

Operating Modes and System Clocks ......................................................... 40

S�stem C�ocks ...................................................................................................................... 40

S�stem Operation Modes...................................................................................................... 41

Contro� Register .................................................................................................................... 4�

Fast Wake-�p........................................................................................................................ 44

Operating Mode Switching.................................................................................................... 45

Standb� C�rrent Considerations........................................................................................... 49

Wake-�p................................................................................................................................ 49

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

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

Watchdog Timer C�ock So�rce.............................................................................................. 50

Watchdog Timer Contro� Register ......................................................................................... 50

Watchdog Timer Operation ................................................................................................... 51

Reset and Initialisation.................................................................................. 52

Reset F�nctions .................................................................................................................... 53

Reset Initia� Conditions ......................................................................................................... 55

Input/Output Ports......................................................................................... 60

I/O Resistor Lists................................................................................................................... �0

P��-high Resistors ................................................................................................................ �1

Port A Wake-�p ..................................................................................................................... ��

Pin-remapping F�nctions ...................................................................................................... �4

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