HT45R4U datasheet(4/105 Pages) HOLTEK

4 / 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

Buzzer............................................................................................................. 58

PA0/PA1 Pin Fun�tion Cont�ol............................................................................................... �8

Interrupts........................................................................................................ 60

Inte��upt Ope�ation................................................................................................................ 60

Inte��upt P�io�ity..................................................................................................................... 61

Inte��upt Registe�s................................................................................................................. 6�

Exte�nal Inte��upt................................................................................................................... 64

Time�/Event Counte� Inte��upt............................................................................................... 64

�ulti-fun�tion Inte��upt .......................................................................................................... 6�

A/D Inte��upt.......................................................................................................................... 6�

Time Base Inte��upt............................................................................................................... 6�

P�og�amming Conside�ations................................................................................................ 66

Reset and Initialisation.................................................................................. 67

Reset Fun�tions .................................................................................................................... 67

Reset Initial Conditions ......................................................................................................... 70

Oscillator ........................................................................................................ 72

System Clock Configurations................................................................................................ 7�

Exte�nal C�ystal/Ce�ami� Os�illato� – HXT ........................................................................... 7�

Inte�nal Hig� Speed RC Os�illato� – HIRC ........................................................................... 73

Exte�nal 3�.768kHz C�ystal Os�illato� – LXT........................................................................ 73

LXT Os�illato� Low Powe� Fun�tion ...................................................................................... 74

Exte�nal Os�illato� – EC........................................................................................................ 74

Operating Modes and System Clocks ......................................................... 75

System Clo�ks ...................................................................................................................... 7�

System Ope�ating �odes...................................................................................................... 76

Cont�ol Registe� .................................................................................................................... 77

Fast Wake-up........................................................................................................................ 79

Ope�ating �ode Swit��ing.................................................................................................... 79

Standby Cu��ent Conside�ations........................................................................................... 83

Wake-up................................................................................................................................ 83

P�og�amming Conside�ations................................................................................................ 84

Low Voltage Detector − LVD ......................................................................... 85

LVD Ope�ation....................................................................................................................... 8�

Watchdog Timer............................................................................................. 86

Wat��dog Time� Clo�k Sou��e.............................................................................................. 86

Wat��dog Time� Cont�ol Regsite� ......................................................................................... 86

Wat��dog Time� Ope�ation ................................................................................................... 87

Configuration Options................................................................................... 88

Application Circuits....................................................................................... 89

HT45R4U Datasheet(PDF) 4 Page - Holtek Semiconductor Inc

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