HT67F488 datasheet(3/171 Pages) HOLTEK

3 / 171 page

Rev. 1.60

�ove��e� �� 016

HT67F488/HT67F489

TinyPowerTM A/D Flash MCU with LCD & EEPROM

EEPROM Data Memory.................................................................................. 33

EEPROM Data Me�o�y St�uctu�e ........................................................................................ 33

EEPROM Registe�s .............................................................................................................. 33

Reading Data f�o� the EEPROM ......................................................................................... 35

W�iting Data to the EEPROM................................................................................................ 35

W�ite P�otection..................................................................................................................... 35

EEPROM Inte��upt ................................................................................................................ 35

P�og�a��ing Conside�ations................................................................................................ 36

P�og�a��ing Exa�ples........................................................................................................ 36

Oscillators ...................................................................................................... 37

Oscillato� Ove�view .............................................................................................................. 37

System Clock Configurations ............................................................................................... 37

Exte�nal C�ystal/Ce�a�ic Oscillato� – HXT ........................................................................... 38

Inte�nal RC Oscillato� – HIRC .............................................................................................. 38

Exte�nal 3�.768kHz C�ystal Oscillato� – LXT........................................................................ 39

LXT Oscillato� Low Powe� Function ..................................................................................... 40

Inte�nal 3�kHz Oscillato� – LIRC .......................................................................................... 40

Operating Modes and System Clocks ........................................................ 41

Syste� Clocks ..................................................................................................................... 41

Syste� Ope�ation Modes ..................................................................................................... 4�

Cont�ol Registe� .................................................................................................................... 43

Ope�ating Mode Switching ................................................................................................... 45

Stand�y Cu��ent Conside�ations .......................................................................................... 49

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

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

Watchdog Ti�e� Clock Sou�ce.............................................................................................. 50

Watchdog Ti�e� Cont�ol Registe� ......................................................................................... 50

Watchdog Ti�e� Ope�ation ................................................................................................... 51

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

Reset Functions ................................................................................................................... 5�

Reset Initial Conditions ........................................................................................................ 55

Input/Output Ports ........................................................................................ 58

Pull-high Resisto�s ................................................................................................................ 59

Po�t A Wake-up ..................................................................................................................... 59

I/O Po�t Cont�ol Registe�s..................................................................................................... 59

Pin-sha�ed Functions ............................................................................................................ 59

I/O Pin St�uctu�es.................................................................................................................. 60

P�og�a��ing Conside�ations ............................................................................................... 61

Timer Modules – TM ...................................................................................... 62

Int�oduction ........................................................................................................................... 6�

TM Ope�ation ........................................................................................................................ 6�

TM Clock Sou�ce................................................................................................................... 63

TM Inte��upts......................................................................................................................... 63

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