HT66F302 datasheet(3/129 Pages) HOLTEK

3 / 129 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT66F302/HT66F303

Cost-Effective Flash MCU with EEPROM

HT66F302/HT66F303

Cost-Effective Flash MCU with EEPROM

EEPROM Data Memory...................................................................................... 28

EEPROM Data Memory Structure .............................................................................................28

EEPROM Registers ...................................................................................................................29

Reading Data from the EEPROM .............................................................................................31

Writing Data to the EEPROM.....................................................................................................31

Write Protection..........................................................................................................................31

EEPROM Interrupt .....................................................................................................................31

Programming Considerations.....................................................................................................32

Oscillators .......................................................................................................... 33

Oscillator Overview ....................................................................................................................33

System Clock Configurations.....................................................................................................33

Internal RC Oscillator – HIRC ....................................................................................................34

Internal 32kHz Oscillator – LIRC................................................................................................34

Supplementary Oscillator...........................................................................................................34

Operating Modes and System Clocks ............................................................. 34

System Clocks ...........................................................................................................................34

System Operation Modes...........................................................................................................35

Control Register .........................................................................................................................37

Operating Mode Switching ........................................................................................................39

Standby Current Considerations................................................................................................43

Wake-up.....................................................................................................................................43

Watchdog Timer................................................................................................. 44

Watchdog Timer Clock Source...................................................................................................44

Watchdog Timer Control Register ..............................................................................................44

Watchdog Timer Operation ........................................................................................................45

Reset and Initialisation...................................................................................... 46

Reset Functions .........................................................................................................................46

Reset Initial Conditions ..............................................................................................................50

Input/Output Ports............................................................................................. 52

Pull-high Resistors .....................................................................................................................53

Port A Wake-up ..........................................................................................................................54

I/O Port Control Registers..........................................................................................................54

Pin-shared Functions .................................................................................................................55

Pin-shared Registers..................................................................................................................55

I/O Pin Structures.......................................................................................................................57

Programming Considerations.....................................................................................................58

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