HT67F4892 datasheet(3/188 Pages) HOLTEK

3 / 188 page

Rev. 1.00

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Rev. 1.00

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HT67F4892

Enhanced A/D Flash MCU with LCD & EEPROM

HT67F4892

Enhanced A/D Flash MCU with LCD & EEPROM

EEPROM Data Memory.................................................................................. 34

EEPROM Data Me�o�y St�uctu�e ........................................................................................ 3�

EEPROM Registe�s .............................................................................................................. 3�

Reading Data f�o� the EEPROM ......................................................................................... 3�

W�iting Data to the EEPROM................................................................................................ 3�

W�ite P�otection..................................................................................................................... 3�

EEPROM Inte��upt ................................................................................................................ 3�

P�og�a��ing Conside�ations................................................................................................ 37

Oscillators ...................................................................................................... 38

Oscillato� Ove�view .............................................................................................................. 38

System Clock Configurations ............................................................................................... 38

Exte�nal High Speed C�ystal Oscillato� – HXT...................................................................... 39

Inte�nal RC Oscillato� – HIRC ............................................................................................... 39

Exte�nal 3�.7�8 kHz C�ystal Oscillato� – LXT....................................................................... �0

Inte�nal 3�kHz Oscillato� – LIRC........................................................................................... �1

Operating Modes and System Clocks ......................................................... 42

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

Syste� Ope�ation Modes...................................................................................................... �3

Cont�ol Registe�s .................................................................................................................. ��

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

Stand�y Cu��ent Conside�ations........................................................................................... 50

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

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

Watchdog Ti�e� Clock Sou�ce.............................................................................................. 51

Watchdog Ti�e� Cont�ol Registe� ......................................................................................... 51

Watchdog Ti�e� Ope�ation ................................................................................................... 5�

Reset and Initialisation.................................................................................. 53

Reset Functions .................................................................................................................... 53

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

Input/Output Ports ........................................................................................ 59

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

Po�t A Wake-up ..................................................................................................................... �0

I/O Po�t Cont�ol Registe�s..................................................................................................... �0

Pin-sha�ed Functions ............................................................................................................ �1

I/O Pin St�uctu�es.................................................................................................................. �1

P�og�a��ing Conside�ations................................................................................................ �1

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

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

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

TM Clock Sou�ce................................................................................................................... �3

TM Inte��upts......................................................................................................................... �3

TM Exte�nal Pins................................................................................................................... �3

TM Input/Output Pin Cont�ol Registe�................................................................................... ��

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

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