HT45F4M View Datasheet(PDF) - Holtek Semiconductor

Part Name

Description

Manufacturer

HT45F4M

Lithium Battery Backup Power ASSP MCU

Holtek Semiconductor 

HT45F4M

Lithium Battery Backup Power ASSP MCU

Writing Data to the EEPROM................................................................................................. 29

Write Protection...................................................................................................................... 29

EEPROM Interrupt................................................................................................................. 29

Programming Considerations................................................................................................. 30

Oscillator......................................................................................................... 31

Oscillator Overview................................................................................................................ 31

System Clock Configurations................................................................................................. 31

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

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

Operating Modes and System Clocks.......................................................... 32

System Clocks....................................................................................................................... 32

System Operation Modes....................................................................................................... 33

Control Register..................................................................................................................... 35

Operating Mode Switching..................................................................................................... 37

NORMAL Mode to SLOW Mode Switching............................................................................ 37

SLOW Mode to NORMAL Mode Switching ........................................................................... 37

Entering the SLEEP Mode..................................................................................................... 37

Entering the IDLE0 Mode....................................................................................................... 38

Entering the IDLE1 Mode....................................................................................................... 38

Standby Current Considerations............................................................................................ 40

Wake-up................................................................................................................................. 40

Watchdog Timer.............................................................................................. 41

Watchdog Timer Clock Source............................................................................................... 41

Watchdog Timer Control Register.......................................................................................... 41

Watchdog Timer Operation.................................................................................................... 42

Reset and Initialisation................................................................................... 43

Reset Functions..................................................................................................................... 43

Reset Initial Conditions.......................................................................................................... 46

Input/Output Ports.......................................................................................... 49

Pull-high Resistors................................................................................................................. 49

Port A Wake-up...................................................................................................................... 50

I/O Port Control Registers...................................................................................................... 50

I/O Pin Structures................................................................................................................... 51

Programming Considerations................................................................................................. 52

Timer Modules – TM....................................................................................... 52

Introduction............................................................................................................................ 52

TM Operation......................................................................................................................... 53

TM Clock Source.................................................................................................................... 53

TM Interrupts.......................................................................................................................... 53

TM External Pins.................................................................................................................... 54

TM Input/Output Pin Control Register.................................................................................... 55

Programming Considerations................................................................................................. 57

Rev. 1.10

3

January 15, 2013

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