HT68F002 datasheet(3/119 Pages) HOLTEK

3 / 119 page

Rev. 1.41

April 11, 2017

Rev. 1.41

April 11, 2017

HT68F002/HT68F0025/HT68F003

Cost-Effective Flash MCU with EEPROM

HT68F002/HT68F0025/HT68F003

Cost-Effective Flash MCU with EEPROM

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

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

EEPROM Registers .............................................................................................................. 28

Reading Data from the EEPROM ........................................................................................ 30

Writing Data to the EEPROM................................................................................................ 30

Write Protection..................................................................................................................... 30

EEPROM Interrupt ................................................................................................................ 30

Programming Considerations................................................................................................ 31

Oscillators ...................................................................................................... 32

Oscillator Overview ............................................................................................................... 32

System Clock Configurations................................................................................................ 32

Internal RC Oscillator – HIRC ............................................................................................... 32

Internal 32kHz Oscillator – LIRC........................................................................................... 33

Supplementary Oscillator...................................................................................................... 33

Operating Modes and System Clocks ......................................................... 33

System Clocks ...................................................................................................................... 33

System Operation Modes...................................................................................................... 34

Control Register .................................................................................................................... 36

Operating Mode Switching ................................................................................................... 38

Standby Current Considerations........................................................................................... 42

Wake-up................................................................................................................................ 42

Watchdog Timer............................................................................................. 43

Watchdog Timer Clock Source.............................................................................................. 43

Watchdog Timer Control Register ......................................................................................... 43

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

Reset and Initialisation.................................................................................. 45

Reset Functions .................................................................................................................... 45

Reset Initial Conditions ......................................................................................................... 48

Input/Output Ports......................................................................................... 50

Pull-high Resistors ................................................................................................................ 51

Port A Wake-up ..................................................................................................................... 52

I/O Port Control Registers..................................................................................................... 52

Pin-Shared Functions............................................................................................................ 53

I/O Pin Structures.................................................................................................................. 56

Programming Considerations................................................................................................ 56

Timer Modules – TM ...................................................................................... 57

Introduction ........................................................................................................................... 57

TM Operation ........................................................................................................................ 57

TM Clock Source................................................................................................................... 57

TM Interrupts......................................................................................................................... 58

TM External Pins................................................................................................................... 58

TM Input/Output Pin Control ................................................................................................. 58

Programming Considerations................................................................................................ 59

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