HT45F3420 datasheet(3/141 Pages) HOLTEK

3 / 141 page

Rev. 1.31

April 11, 2017

Rev. 1.31

April 11, 2017

HT45F3420/HT45F3430

Personal Care Flash MCU

HT45F3420/HT45F3430

Personal Care Flash MCU

Special Function Register Description........................................................ 29

Indirect Addressing Registers – IAR0, IAR1 ......................................................................... 29

Memory Pointers – MP0, MP1 .............................................................................................. 29

Bank Pointer – BP................................................................................................................. 30

Accumulator – ACC............................................................................................................... 30

Program Counter Low Register – PCL.................................................................................. 30

Look-up Table Registers – TBLP, TBLH................................................................................ 31

Status Register – STATUS.................................................................................................... 31

EEPROM Data Memory.................................................................................. 33

EEPROM Data Memory Structure ........................................................................................ 33

EEPROM Registers .............................................................................................................. 33

Reading Data from the EEPROM ......................................................................................... 35

Writing Data to the EEPROM................................................................................................ 35

Write Protection..................................................................................................................... 35

EEPROM Interrupt ................................................................................................................ 35

Programming Considerations................................................................................................ 36

Oscillators ...................................................................................................... 37

Oscillator Overview ............................................................................................................... 37

System Clock Configurations................................................................................................ 37

High Speed Internal RC Oscillator – HIRC ........................................................................... 38

Internal 32kHz Oscillator – LIRC........................................................................................... 38

Supplementary Oscillator...................................................................................................... 38

Operating Modes and System Clocks ......................................................... 38

System Clocks ...................................................................................................................... 38

System Operating Modes...................................................................................................... 40

Control Registers .................................................................................................................. 41

Operating Mode Switching ................................................................................................... 42

Standby Current Considerations........................................................................................... 45

Wake-up................................................................................................................................ 45

Watchdog Timer............................................................................................. 46

Watchdog Timer Clock Source.............................................................................................. 46

Watchdog Timer Control Register ......................................................................................... 46

Watchdog Timer Operation ................................................................................................... 47

Reset and Initialisation.................................................................................. 48

Reset Functions .................................................................................................................... 48

Reset Initial Conditions ......................................................................................................... 49

Input/Output Ports......................................................................................... 54

Pull-high Resistors ................................................................................................................ 54

Port A Wake-up ..................................................................................................................... 55

I/O Port Control Registers..................................................................................................... 56

Pin-shared Functions ............................................................................................................ 57

I/O Port Source Current Control – only for HT45F3430........................................................ 62

I/O Pin Structures.................................................................................................................. 63

Programming Considerations ............................................................................................... 64

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