HT45F2020 datasheet(3/85 Pages) HOLTEK

3 / 85 page

Rev. 1.00

April 11, 2017

Rev. 1.00

April 11, 2017

HT45F2020/HT45F2022

Sound Effect Generator Flash MCU

HT45F2020/HT45F2022

Sound Effect Generator Flash MCU

High Speed Internal RC Oscillator – HIRC ...............................................................................24

Internal 32kHz Oscillator – LIRC ...............................................................................................24

Supplementary Oscillators ........................................................................................................24

Operating Modes and System Clocks ............................................................ 24

System Clocks ..........................................................................................................................24

System Operation Modes...........................................................................................................25

Control Register .........................................................................................................................27

Operating Mode Switching ........................................................................................................28

Standby Current Considerations ...............................................................................................32

Wake-up.....................................................................................................................................32

Watchdog Timer................................................................................................. 33

Watchdog Timer Clock Source...................................................................................................33

Watchdog Timer Control Register ..............................................................................................33

Watchdog Timer Operation ........................................................................................................34

Reset and Initialisation...................................................................................... 35

Reset Functions .........................................................................................................................35

Reset Initial Conditions .............................................................................................................36

Input/Output Ports ............................................................................................ 38

Pull-high Resistors .....................................................................................................................38

Port A Wake-up ..........................................................................................................................39

I/O Port Control Registers..........................................................................................................39

Pin-shared Functions .................................................................................................................40

I/O Pin Structures.......................................................................................................................41

Programming Considerations ....................................................................................................41

Timer Modules – TM .......................................................................................... 42

Introduction ................................................................................................................................42

TM Operation .............................................................................................................................42

TM Clock Source........................................................................................................................42

TM Interrupts..............................................................................................................................42

TM External Pins .......................................................................................................................43

TM Input/Output Pin Selection ...................................................................................................43

Programming Considerations.....................................................................................................44

Periodic Type TM – PTM.................................................................................... 45

Periodic TM Operation ...............................................................................................................45

Periodic Type TM Register Description......................................................................................46

Periodic Type TM Operation Modes...........................................................................................50

Shunt Regulator – for HT45F2020 only............................................................ 59

Sound Effect Generator .................................................................................... 60

Interrupts............................................................................................................ 60

Interrupt Registers......................................................................................................................60

Interrupt Operation.....................................................................................................................62

Multi-function Interrupt ...............................................................................................................63

HT45F2020 Datasheet(PDF) 3 Page - Holtek Semiconductor Inc

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