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HT45FM2C

Brushless DC Motor Flash Type 8-Bit MCU

Holtek Semiconductor 

HT45FM2C

Preliminary

Brushless DC Motor Flash Type 8-Bit MCU

EEPROM Data Memory................................................................................... 31

EEPROM Data Memory Structure......................................................................................... 31

EEPROM Registers............................................................................................................... 31

Reading Data from the EEPROM.......................................................................................... 32

Writing Data to the EEPROM................................................................................................. 33

Write Protection...................................................................................................................... 33

EEPROM Interrupt................................................................................................................. 33

Programming Consideration.................................................................................................. 33

Programming Examples......................................................................................................... 34

Oscillator......................................................................................................... 35

Oscillator Overview................................................................................................................ 35

System Clock Configurations................................................................................................. 35

Internal 20MHz RC Oscillator – HIRC.................................................................................... 36

Internal 32kHz Oscillator – LIRC............................................................................................ 36

Supplementary Clocks........................................................................................................... 36

Operating Modes and System Clocks.......................................................... 37

System Clocks....................................................................................................................... 37

System Operation Modes....................................................................................................... 39

Control Register..................................................................................................................... 40

Fast Wake-up......................................................................................................................... 41

Operating Mode Switching and Wake-up............................................................................... 43

NORMAL Mode to SLOW Mode Switching............................................................................ 43

SLOW Mode to NORMAL Mode Switching............................................................................ 43

Entering the SLEEP Mode..................................................................................................... 45

Entering the IDLE0 Mode....................................................................................................... 45

Entering the IDLE1 Mode....................................................................................................... 45

Standby Current Considerations............................................................................................ 46

Wake-up................................................................................................................................. 46

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

Watchdog Timer Clock Source............................................................................................... 47

Watchdog Timer Control Register.......................................................................................... 47

Watchdog Timer Operation.................................................................................................... 48

Reset and Initialisation................................................................................... 49

Reset Functions..................................................................................................................... 49

Reset Initial Conditions.......................................................................................................... 51

Input/Output Ports.......................................................................................... 55

Pull-high Resistors................................................................................................................. 55

Port A Wake-up...................................................................................................................... 56

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

I/O Pin Structures................................................................................................................... 58

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

Rev. 1.10

3

May 30, 2012

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