Holtek HT45F5Q-3, Manual

Page: 3 / 163

Rev. 1.10 2 November 04, 2019 Rev. 1.10 3 November 04, 2019
HT45F5Q-3
Battery Charger Flash MCU
HT45F5Q-3
Battery Charger Flash MCU
General Purpose Data Memory ..................................................................................................24
Special Purpose Data Memory ...................................................................................................25
Special Function Register Description .............................................................26
Indirect Addressing Registers – IAR0, IAR1 ...............................................................................26
Memory Pointers – MP0, MP1 ....................................................................................................26
Bank Pointer – BP .......................................................................................................................27
Accumulator – ACC .....................................................................................................................27
Program Counter Low Register – PCL ........................................................................................27
Look-up Table Registers – TBLP, TBHP, TBLH ...........................................................................27
Status Register – STATUS ..........................................................................................................28
Emulated EEPROM Data Memory .....................................................................29
Emulated EEPROM Data Memory Structure ..............................................................................29
Emulated EEPROM Registers ....................................................................................................30
Erasing the Emulated EEPROM .................................................................................................33
Writing Data to the Emulated EEPROM ......................................................................................33
Reading Data from the Emulated EEPROM ...............................................................................33
Programming Considerations ......................................................................................................33
Oscillators ...........................................................................................................35
Oscillator Overview .....................................................................................................................35
System Clock Configurations ......................................................................................................35
Internal High Speed RC Oscillator – HIRC .................................................................................36
Internal 32kHz Oscillator – LIRC .................................................................................................36
Operating Modes and System Clocks ..............................................................36
System Clocks ............................................................................................................................36
System Operation Modes ............................................................................................................37
Control Registers ........................................................................................................................38
Operating Mode Switching ..........................................................................................................40
Standby Current Considerations .................................................................................................44
Wake-up ......................................................................................................................................44
Watchdog Timer ..................................................................................................45
Watchdog Timer Clock Source ....................................................................................................45
Watchdog Timer Control Register ...............................................................................................45
Watchdog Timer Operation .........................................................................................................46
Reset and Initialisation .......................................................................................47
Reset Functions ..........................................................................................................................47
Reset Initial Conditions ...............................................................................................................49
Input/Output Ports ..............................................................................................52
Pull-high Resistors ......................................................................................................................52
Port A Wake-up ...........................................................................................................................53
I/O Port Control Registers ...........................................................................................................53
Pin-shared Functions ..................................................................................................................53
I/O Pin Structures ........................................................................................................................58
READ PORT Function.................................................................................................................58
Programming Considerations ......................................................................................................59