HT66F25D datasheet(3/175 Pages) HOLTEK

3 / 175 page

A/D Flash Type 8-bit MCU with EEPROM

HT66F24D/HT66F25D

Rev. 1.10

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�a�� 01�

Rev. 1.10

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

EEPRO� Data �emo�y St�u�tu�e ........................................................................................ ��

EEPRO� Registe�s .............................................................................................................. ��

Reading Data f�om t�e EEPRO� ......................................................................................... �4

W�iting Data to t�e EEPRO�................................................................................................ �4

W�ite P�ote�tion..................................................................................................................... �4

EEPRO� Inte��upt ................................................................................................................ �4

P�og�amming Conside�ations................................................................................................ ��

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

Os�illato� Ove�view ............................................................................................................... �6

System Clock Configurations................................................................................................ �6

Exte�nal C�ystal/Ce�ami� Os�illato� – HXT ........................................................................... �7

Inte�nal Hig� Speed RC Os�illato� – HIRC ........................................................................... �8

Inte�nal ��kHz Os�illato� – LIRC........................................................................................... �8

Exte�nal ��.768kHz C�ystal Os�illato� – LXT........................................................................ �8

Supplementa�y Os�illato�...................................................................................................... �9

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

System Clo�ks ...................................................................................................................... 40

System Ope�ation �odes...................................................................................................... 41

Cont�ol Registe� .................................................................................................................... 4�

Fast Wake-up........................................................................................................................ 44

Ope�ating �ode Swit��ing.................................................................................................... 4�

Standby Cu��ent Conside�ations........................................................................................... 49

Wake-up................................................................................................................................ 49

P�og�amming Conside�ations................................................................................................ 49

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

Wat��dog Time� Clo�k Sou��e.............................................................................................. �0

Wat��dog Time� Cont�ol Registe� ......................................................................................... �0

Wat��dog Time� Ope�ation ................................................................................................... �1

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

Reset Fun�tions .................................................................................................................... ��

Reset Initial Conditions ......................................................................................................... ��

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

I/O Resisto� Lists................................................................................................................... 60

Pull-�ig� Resisto�s ................................................................................................................ 61

Po�t A Wake-up ..................................................................................................................... 6�

Pin-�emapping Fun�tions ...................................................................................................... 64

HT66F25D Datasheet(PDF) 3 Page - Holtek Semiconductor Inc

HT66F25D Datasheet(HTML) 3 Page - Holtek Semiconductor Inc

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