HT45F4M datasheet(3/138 Pages) HOLTEK

3 / 138 page

Rev. 1.10

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Rev. 1.10

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HT45F4M

Lithium Battery Backup Power ASSP MCU

HT45F4M

Lithium Battery Backup Power ASSP MCU

W�iting Data to the EEPROM................................................................................................ �9

W�ite P�otection..................................................................................................................... �9

EEPROM Inte��pt ................................................................................................................ �9

P�og�amming Conside�ations................................................................................................ �0

Oscillator ........................................................................................................ 31

Oscillato� Ove�view ............................................................................................................... �1

System Clock Configurations................................................................................................ �1

Inte�nal RC Oscillato� – HIRC ............................................................................................... ��

Inte�nal ��kHz Oscillato� – LIRC........................................................................................... ��

Operating Modes and System Clocks ......................................................... 32

S�stem Clocks ...................................................................................................................... ��

S�stem Ope�ation Modes...................................................................................................... ��

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

Ope�ating Mode Switching.................................................................................................... �7

NORMAL Mode to SLOW Mode Switching........................................................................... �7

SLOW Mode to NORMAL Mode Switching .......................................................................... �7

Ente�ing the SLEEP Mode .................................................................................................... �7

Ente�ing the IDLE0 Mode...................................................................................................... �8

Ente�ing the IDLE1 Mode...................................................................................................... �8

Standb� C��ent Conside�ations........................................................................................... 40

Wake-�p................................................................................................................................ 40

Watchdog Timer............................................................................................. 41

Watchdog Time� Clock So��ce.............................................................................................. 41

Watchdog Time� Cont�ol Registe� ......................................................................................... 41

Watchdog Time� Ope�ation ................................................................................................... 4�

Reset and Initialisation.................................................................................. 43

Reset F�nctions .................................................................................................................... 4�

Reset Initial Conditions ......................................................................................................... 46

Input/Output Ports......................................................................................... 49

P�ll-high Resisto�s ................................................................................................................ 49

Po�t A Wake-�p ..................................................................................................................... �0

I/O Po�t Cont�ol Registe�s..................................................................................................... �0

I/O Pin St��ct��es.................................................................................................................. �1

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

Timer Modules – TM ...................................................................................... 52

Int�od�ction ........................................................................................................................... ��

TM Ope�ation ........................................................................................................................ ��

TM Clock So��ce................................................................................................................... ��

TM Inte��pts......................................................................................................................... ��

TM Exte�nal Pins................................................................................................................... �4

TM Inp�t/O�tp�t Pin Cont�ol Registe�................................................................................... ��

P�og�amming Conside�ations................................................................................................ �7

HT45F4M データシート(PDF) 3 Page - Holtek Semiconductor Inc

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