HT45F56 datasheet(3/90 Pages) HOLTEK

3 / 90 page

Rev. 1.11

April 11, 2017

Rev. 1.11

April 11, 2017

HT45F56

Shock Detector Flash MCU

HT45F56

Shock Detector Flash MCU

EEPROM Data Memory.................................................................................. 24

EEPROM Data Memory Structure ........................................................................................ 24

EEPROM Registers .............................................................................................................. 24

Reading Data from the EEPROM ......................................................................................... 26

Writing Data to the EEPROM................................................................................................ 26

Write Protection..................................................................................................................... 26

EEPROM Interrupt ................................................................................................................ 26

Programming Considerations................................................................................................ 27

Oscillator ........................................................................................................ 28

Oscillator Overview ............................................................................................................... 28

System Clock Configurations................................................................................................ 28

Internal High Speed RC Oscillator – HIRC ........................................................................... 29

Internal 32kHz Oscillator – LIRC........................................................................................... 29

Supplementary Oscillators .................................................................................................... 29

Operating Modes and System Clocks ......................................................... 29

System Clocks ...................................................................................................................... 29

System Operation Modes...................................................................................................... 30

Control Registers .................................................................................................................. 31

Operating Mode Switching.................................................................................................... 33

Standby Current Considerations........................................................................................... 37

Wake-up................................................................................................................................ 37

Watchdog Timer............................................................................................. 38

Watchdog Timer Clock Source.............................................................................................. 38

Watchdog Timer Control Register ......................................................................................... 38

Watchdog Timer Operation ................................................................................................... 39

Reset and Initialisation.................................................................................. 40

Reset Functions .................................................................................................................... 40

Reset Initial Conditions ......................................................................................................... 45

Input/Output Ports......................................................................................... 47

Pull-high Resistors ................................................................................................................ 47

Port A Wake-up ..................................................................................................................... 48

I/O Port Control Register....................................................................................................... 48

Pin-shared Functions ............................................................................................................ 48

I/O Pin Structures.................................................................................................................. 49

Programming Considerations................................................................................................ 50

Compact Type Timer Module – CTM ............................................................ 51

Compact TM Operation......................................................................................................... 52

Compact Type TM Register Description................................................................................ 52

Compact Type TM Operation Modes .................................................................................... 56

Programming Considerations................................................................................................ 62

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