Holtek HT66F0175 - TM Inp�T;O�Tp�T Pin Control Re�Ister; 4-Pin SOP (300 Mil) O�Tline Dimensions

Rev. 1.50 2 August 28, 2017 Rev. 1.50 3 August 28, 2017
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
HT66F0175/HT66F0185
A/D Flash MCU with EEPROM
EEPROM Data Memory ...................................................................................... 37
EEPROM Data Memory Structure .............................................................................................37
EEPROM Registers ...................................................................................................................37
Reading Data from the EEPROM ..............................................................................................39
Writing Data to the EEPROM .....................................................................................................39
Write Protection .......................................................................................................................... 39
EEPROM Interrupt .....................................................................................................................39
Programming Considerations .....................................................................................................40
Oscillator ............................................................................................................ 41
Oscillator Overview ....................................................................................................................41
System Clock Congurations .....................................................................................................41
External Crystal/Ceramic Oscillator – HXT ................................................................................42
Internal High Speed RC Oscillator – HIRC ................................................................................43
External 32.768 kHz Crystal Oscillator – LXT ............................................................................43
Internal 32kHz Oscillator – LIRC ................................................................................................ 44
Supplementary Oscillators .........................................................................................................44
Operating Modes and System Clocks ............................................................. 45
System Clocks ...........................................................................................................................45
System Operation Modes ...........................................................................................................46
Control Registers .......................................................................................................................47
Fast Wake-up .............................................................................................................................49
Operating Mode Switching .........................................................................................................50
Standby Current Considerations ................................................................................................54
Wake-up .....................................................................................................................................54
Programming Considerations .....................................................................................................55
Watchdog Timer ................................................................................................. 55
Watchdog Timer Clock Source ................................................................................................... 55
Watchdog Timer Control Register ..............................................................................................55
Watchdog Timer Operation ........................................................................................................57
Reset and Initialisation ...................................................................................... 58
Reset Functions .........................................................................................................................58
Reset Initial Conditions ..............................................................................................................60
Input/Output Ports ............................................................................................. 64
Pull-high Resistors .....................................................................................................................65
Port A Wake-up ..........................................................................................................................65
I/O Port Control Registers ..........................................................................................................66
I/O Port Source Current Control ................................................................................................. 66
Pin-remapping Functions ...........................................................................................................68
I/O Pin Structures ....................................................................................................................... 69
Programming Considerations .....................................................................................................70