HT45F23A View Datasheet(PDF) - Holtek Semiconductor

Part Name

Description

Manufacturer

HT45F23A

8-Bit Flash MCU with Op Amps & Comparators

Holtek Semiconductor 

HT45F23A

8-Bit Flash MCU with Op Amps & Comparators

Reading Data from the EEPROM.......................................................................................... 33

Writing Data to the EEPROM................................................................................................. 34

Write Protection...................................................................................................................... 34

EEPROM Interrupt................................................................................................................. 34

Programming Considerations................................................................................................. 34

Programming Examples......................................................................................................... 35

Oscillator......................................................................................................... 36

Oscillator Overview................................................................................................................ 36

System Clock Configurations................................................................................................. 36

External Crystal/Ceramic Oscillator – HXT............................................................................ 37

External RC Oscillator – ERC................................................................................................ 37

External Oscillator – EC......................................................................................................... 38

Internal RC Oscillator – HIRC................................................................................................ 38

External 32.768kHz Crystal Oscillator – LXT......................................................................... 38

LXT Oscillator Low Power Function....................................................................................... 39

Internal 32kHz Oscillator – LIRC............................................................................................ 39

Supplementary Oscillators..................................................................................................... 40

Operating Modes and System Clocks.......................................................... 40

System Clocks....................................................................................................................... 40

System Operation Modes....................................................................................................... 40

Control Register..................................................................................................................... 42

Fast Wake-up......................................................................................................................... 44

Operating Mode Switching and Wake-up............................................................................... 44

NORMAL Mode to SLOW Mode Switching............................................................................ 45

SLOW Mode to NORMAL Mode Switching............................................................................ 47

Entering the SLEEP0 Mode................................................................................................... 47

Entering the SLEEP1 Mode................................................................................................... 47

Entering the IDLE0 Mode....................................................................................................... 48

Entering the IDLE1 Mode....................................................................................................... 48

Standby Current Considerations............................................................................................ 48

Wake-up................................................................................................................................. 49

Programming Considerations................................................................................................. 49

Watchdog Timer.............................................................................................. 50

Watchdog Timer Clock Source............................................................................................... 50

Watchdog Timer Control Register.......................................................................................... 50

Watchdog Timer Operation.................................................................................................... 51

Reset and Initialisation................................................................................... 52

Reset Functions..................................................................................................................... 52

Reset Initial Conditions.......................................................................................................... 54

Input/Output Ports.......................................................................................... 57

Pull-high Resistors................................................................................................................. 57

Port A Wake-up...................................................................................................................... 58

I/O Port Control Registers...................................................................................................... 58

Rev. 1.00

3

July 03, 2012

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