HT67F40 datasheet(3/242 Pages) HOLTEK

3 / 242 page

HT67F30/HT67F40/HT67F50/HT67F60

TinyPowerTM A/D Flash Type 8-Bit MCU with LCD & EEPROM

Rev. 1.50

March 06 , 2012

Rev. 1.50

March 06 , 2012

Writing Data to the EEPROM................................................................................................ 51

Write Protection..................................................................................................................... 51

EEPROM Interrupt ................................................................................................................ 51

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

Oscillator ......................................................................................................... 53

Oscillator Overview ............................................................................................................... 53

System Clock Configurations................................................................................................ 53

External Crystal/ Ceramic Oscillator – HXT .......................................................................... 54

External RC Oscillator – ERC ............................................................................................... 55

Internal RC Oscillator – HIRC ............................................................................................... 56

External 32.768kHz Crystal Oscillator – LXT........................................................................ 56

LXT Oscillator Low Power Function ...................................................................................... 57

Internal 32kHz Oscillator – LIRC........................................................................................... 57

External Clock – EC.............................................................................................................. 57

Supplementary Oscillators .................................................................................................... 57

Operating Modes and System Clocks .......................................................... 58

System Clocks ...................................................................................................................... 58

System Operation Modes...................................................................................................... 60

Control Register .................................................................................................................... 61

Fast Wake-up........................................................................................................................ 62

Operating Mode Switching and Wake-up.............................................................................. 64

NORMAL Mode to SLOW Mode Switching........................................................................... 64

SLOW Mode to NORMAL Mode Switching........................................................................... 66

Entering the SLEEP0 Mode .................................................................................................. 66

Entering the SLEEP1 Mode .................................................................................................. 66

Entering the IDLE0 Mode...................................................................................................... 67

Entering the IDLE1 Mode...................................................................................................... 67

Standby Current Considerations........................................................................................... 67

Wake-up................................................................................................................................ 68

Programming Considerations................................................................................................ 68

Watchdog Timer.............................................................................................. 69

Watchdog Timer Clock Source.............................................................................................. 69

Watchdog Timer Control Register ......................................................................................... 69

Watchdog Timer Operation ................................................................................................... 70

Reset and Initialisation.......................................................................................................... 71

Reset Functions .................................................................................................................... 71

Reset Initial Conditions ......................................................................................................... 74

Input/Output Ports.......................................................................................... 85

Pull-high Resistors ................................................................................................................ 88

Port A Wake-up ..................................................................................................................... 90

I/O Port Control Registers..................................................................................................... 90

Pin-remapping Functions ...................................................................................................... 92

Pin-remapping Registers....................................................................................................... 92

I/O Pin Structures.................................................................................................................. 98

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