HT45F77 datasheet(3/203 Pages) HOLTEK

3 / 203 page

Rev. 1.20

De�e��e� 1�� 201�

Rev. 1.20

De�e��e� 1�� 201�

HT45F77

Body Fat Scale Flash MCU

HT45F77

Body Fat Scale Flash MCU

EEPROM Data Memory.................................................................................. 39

EEPROM Data Me�o�y St�u�tu�e ........................................................................................ 39

EEPROM Registe�s .............................................................................................................. 39

Reading Data f�o� the EEPROM ......................................................................................... �1

W�iting Data to the EEPROM................................................................................................ �1

W�ite P�ote�tion..................................................................................................................... �1

EEPROM Inte��upt ................................................................................................................ �1

P�og�a��ing Conside�ations................................................................................................ �2

Oscillators ...................................................................................................... 43

Os�illato� Ove�view .............................................................................................................. �3

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

Exte�nal C�ystal/Ce�a�i� Os�illato� – HXT ........................................................................... ��

Inte�nal RC Os�illato� – HIRC ............................................................................................... �5

Inte�nal 32kHz Os�illato� – LIRC........................................................................................... �5

Exte�nal 32.7�8kHz C�ystal Os�illato� – LXT........................................................................ �5

Supple�enta�y Os�illato�s .................................................................................................... �7

Operating Modes and System Clocks ......................................................... 47

Syste� Clo�ks ...................................................................................................................... �7

Syste� Ope�ation Modes ..................................................................................................... �9

Cont�ol Registe� .................................................................................................................... 50

Fast Wake-up........................................................................................................................ 52

Ope�ating Mode Swit�hing ................................................................................................... 53

Stand�y Cu��ent Conside�ations .......................................................................................... 57

Wake-up ............................................................................................................................... 58

P�og�a��ing Conside�ations................................................................................................ 58

Watchdog Timer............................................................................................. 59

Wat�hdog Ti�e� Clo�k Sou��e.............................................................................................. 59

Wat�hdog Ti�e� Cont�ol Registe� ......................................................................................... 59

Wat�hdog Ti�e� Ope�ation ................................................................................................... �0

Reset and Initialisation ................................................................................. 62

Reset Fun�tions .................................................................................................................... �2

Reset Initial Conditions ........................................................................................................ �5

Input/Output Ports ........................................................................................ 69

I/O Registe� List .................................................................................................................... �9

Pull-high Resisto�s ................................................................................................................ �9

Po�t A Wake-up ..................................................................................................................... 71

I/O Po�t Cont�ol Registe�s..................................................................................................... 71

I/O Pin St�u�tu�es.................................................................................................................. 73

P�og�a��ing Conside�ations ............................................................................................... 73

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