Holtek HT68F Series Manual page 3

HT68F20/HT68F30/HT68F40/HT68F50/HT68F60
HT68FU30/HT68FU40/HT68FU50/HT68FU60
Enhanced I/O Flash Type 8-Bit MCU with EEPROM
EEPROM Data Memory .................................................................................. 43
EEPROM Data Memor� Str�ct�re ........................................................................................ �3
EEPROM Registers .............................................................................................................. �3
Reading Data from the EEPROM ......................................................................................... �7
Writing Data to the EEPROM ................................................................................................ �7
Write Protection ..................................................................................................................... �7
EEPROM Interr�pt ................................................................................................................ �7
Programming Considerations ................................................................................................ �8
Oscillator ........................................................................................................ 49
Osci��ator Overview ............................................................................................................... �9
System Clock Configurations ................................................................................................ �9
Externa� Cr�sta�/Ceramic Osci��ator - HXT ........................................................................... 51
Externa� RC Osci��ator - ERC ............................................................................................... 52
Interna� RC Osci��ator - HIRC ............................................................................................... 52
Externa� 32.768kHz Cr�sta� Osci��ator - LXT ........................................................................ 53
LXT Osci��ator Low Power F�nction ...................................................................................... 5�
Interna� 32kHz Osci��ator - LIRC ........................................................................................... 5�
S�pp�ementar� Osci��ators .................................................................................................... 5�
Operating Modes and System Clocks ......................................................... 55
S�stem C�ocks ...................................................................................................................... 55
S�stem Operation Modes ...................................................................................................... 57
Contro� Register .................................................................................................................... 58
Fast Wake-�p ........................................................................................................................ 60
Operating Mode Switching and Wake-�p .............................................................................. 61
NORMAL Mode to SLOW Mode Switching ........................................................................... 62
SLOW Mode to NORMAL Mode Switching ........................................................................... 63
Entering the SLEEP1 Mode .................................................................................................. 6�
Entering the IDLE0 Mode ...................................................................................................... 6�
Entering the IDLE1 Mode ...................................................................................................... 65
Standb� C�rrent Considerations ........................................................................................... 65
Wake-�p ................................................................................................................................ 66
Programming Considerations ................................................................................................ 66
Watchdog Timer ............................................................................................. 67
Watchdog Timer C�ock So�rce .............................................................................................. 67
Watchdog Timer Contro� Register ......................................................................................... 67
Watchdog Timer Operation ................................................................................................... 68
Reset and Initialisation .................................................................................. 69
Reset F�nctions .................................................................................................................... 69
Reset Initia� Conditions ......................................................................................................... 72
Rev. 2.10 3 ���� 02� 201�