HT45R4U datasheet(3/105 Pages) HOLTEK

3 / 105 page

Rev. 1.10

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Rev. 1.10

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HT45R4U

TinyPowerTM A/D Type

e-Banking ASSP OTP MCU with LCD

A/D Conve�te� Registe�s – ADRL� ADRH� ADCR0� ADCR1� ACER...................................... �7

Port A Wake-up Register − PAWU ........................................................................................ �7

Pull-High Resistors − PAPU, PBPU, PCPU, PDPU, PEPU .................................................. �8

System �ode �ont�ol Registe� – S�OD ............................................................................... �8

LCD Registers − LCDCTRL, PCFS, PDFS........................................................................... �8

Input/Output Ports......................................................................................... 28

Pull-�ig� Resisto�s ................................................................................................................ �8

Po�t A Wake-up ..................................................................................................................... �9

I/O Po�t Cont�ol Registe�s..................................................................................................... 30

Pin-s�a�ed Fun�tions ............................................................................................................ 31

I/O Pin St�u�tu�es.................................................................................................................. 3�

P�og�amming Conside�ations................................................................................................ 33

LCD Driver...................................................................................................... 34

Display �emo�y .................................................................................................................... 34

LCD Registe�s....................................................................................................................... 3�

LCD Reset Fun�tion.............................................................................................................. 36

Clo�k Sou��e......................................................................................................................... 36

LCD D�ive� Output................................................................................................................. 37

LCD Voltage Sou��e and Biasing.......................................................................................... 37

P�og�amming Conside�ations................................................................................................ 38

Timer/Event Counters ................................................................................... 40

Configuring the Timer/Event Counter Input Clock Source .................................................... 40

Timer Registers − TMR0, TMR1, TMR2................................................................................ 41

Timer Control Registers − TMR0C, TMR1C, TMR2C ........................................................... 41

Configuring the Timer Mode.................................................................................................. 4�

Configuring the Event Counter Mode.................................................................................... 43

Configuring the Pulse Width Measurement Mode................................................................. 43

P�og�ammable F�equen�y Divide� – PFD ............................................................................. 4�

I/O Inte�fa�ing........................................................................................................................ 4�

Time�/Event Counte� Pins Inte�nal Filte� ............................................................................... 46

P�og�amming Conside�ations................................................................................................ 46

Time� P�og�am Example ....................................................................................................... 47

Analog to Digital Converter .......................................................................... 48

A/D Ove�view ........................................................................................................................ 48

A/D Conve�te� Data Registe�s – ADRL� ADRH ..................................................................... 48

A/D Conve�te� Cont�ol Registe� – ADCR0� ADCR1� ACER................................................... 49

A/D Ope�ation ....................................................................................................................... ��

A/D Input Pins ....................................................................................................................... �3

Summa�y of A/D Conve�sion Steps....................................................................................... �4

A/D T�ansfe� Fun�tion ........................................................................................................... ��

P�og�amming Conside�ations................................................................................................ ��

A/D P�og�amming Example................................................................................................... �6

HT45R4U Datasheet(PDF) 3 Page - Holtek Semiconductor Inc

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