HT45F4M
Lithium Battery Backup Power ASSP MCU
Wꢁiting Data to the EEPROM................................................................................................ ꢅ9
Wꢁite Pꢁotection..................................................................................................................... ꢅ9
EEPROM Inteꢁꢁꢀpt ................................................................................................................ ꢅ9
Pꢁogꢁamming Consideꢁations................................................................................................ ꢆ0
Oscillator ........................................................................................................ 31
Oscillatoꢁ Oveꢁview ............................................................................................................... ꢆ1
System Clock Configurations................................................................................................ ꢆ1
Inteꢁnal RC Oscillatoꢁ – HIRC ............................................................................................... ꢆꢅ
Inteꢁnal ꢆꢅkHz Oscillatoꢁ – LIRC........................................................................................... ꢆꢅ
Operating Modes and System Clocks ......................................................... 32
Sꢂstem Clocks ...................................................................................................................... ꢆꢅ
Sꢂstem Opeꢁation Modes...................................................................................................... ꢆꢆ
Contꢁol Registeꢁ .................................................................................................................... ꢆꢃ
Opeꢁating Mode Switching.................................................................................................... ꢆ7
NORMAL Mode to SLOW Mode Switching........................................................................... ꢆ7
SLOW Mode to NORMAL Mode Switching .......................................................................... ꢆ7
Enteꢁing the SLEEP Mode .................................................................................................... ꢆ7
Enteꢁing the IDLE0 Mode...................................................................................................... ꢆ8
Enteꢁing the IDLE1 Mode...................................................................................................... ꢆ8
Standbꢂ Cꢀꢁꢁent Consideꢁations........................................................................................... 40
Wake-ꢀp................................................................................................................................ 40
Watchdog Timer............................................................................................. 41
Watchdog Timeꢁ Clock Soꢀꢁce.............................................................................................. 41
Watchdog Timeꢁ Contꢁol Registeꢁ......................................................................................... 41
Watchdog Timeꢁ Opeꢁation ................................................................................................... 4ꢅ
Reset and Initialisation.................................................................................. 43
Reset Fꢀnctions .................................................................................................................... 4ꢆ
Reset Initial Conditions ......................................................................................................... 46
Input/Output Ports......................................................................................... 49
Pꢀll-high Resistoꢁs ................................................................................................................ 49
Poꢁt A Wake-ꢀp ..................................................................................................................... ꢃ0
I/O Poꢁt Contꢁol Registeꢁs..................................................................................................... ꢃ0
I/O Pin Stꢁꢀctꢀꢁes.................................................................................................................. ꢃ1
Pꢁogꢁamming Consideꢁations................................................................................................ ꢃꢅ
Timer Modules – TM ...................................................................................... 52
Intꢁodꢀction ........................................................................................................................... ꢃꢅ
TM Opeꢁation ........................................................................................................................ ꢃꢆ
TM Clock Soꢀꢁce................................................................................................................... ꢃꢆ
TM Inteꢁꢁꢀpts......................................................................................................................... ꢃꢆ
TM Exteꢁnal Pins................................................................................................................... ꢃ4
TM Inpꢀt/Oꢀtpꢀt Pin Contꢁol Registeꢁ................................................................................... ꢃꢃ
Pꢁogꢁamming Consideꢁations................................................................................................ ꢃ7
Rev. 1.10
ꢆ
�anꢀaꢁꢂ 1ꢃꢄ ꢅ01ꢆ
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
