BS85B12-3 HOLTEK [Holtek Semiconductor Inc], BS85B12-3 Datasheet - Page 3

• Manufacturer Part Number: BS85B12-3
• Description: Touch Key Flash Type 8-Bit MCU with LCD/LED Driver
• Manufacturer: HOLTEK [Holtek Semiconductor Inc]

Contents
Special Function Register Description ...........................................23
EEPROM Data Memory .....................................................................28
Oscillator............................................................................................32
Operating Modes and System Clocks .............................................34
Watchdog Timer ................................................................................41
Reset and Initialisation .....................................................................43
Indirect Addressing Registers IAR0, IAR1..........................................................23
Memory Pointers MP0, MP1 ..............................................................................23
Bank Pointer
Accumulator ACC ..............................................................................................26
Program Counter Low Register
Look-up Table Registers
Status Register
EEPROM Data Memory Structure ........................................................................28
Reading Data from the EEPROM .........................................................................30
Writing Data to the EEPROM ...............................................................................30
Write Protection ....................................................................................................30
EEPROM Interrupt ...............................................................................................30
Programming Considerations ...............................................................................31
Programming Examples .......................................................................................31
Oscillator Overview...............................................................................................32
System Clock Configurations................................................................................32
Internal High Speed RC Oscillator
Internal Low Speed RC Oscillator
System Clocks......................................................................................................34
Control Register ...................................................................................................35
System Operation Modes .....................................................................................36
Operating Mode Switching....................................................................................37
NORMAL Mode to SLOW Mode Switching...........................................................38
SLOW Mode to NORMAL Mode Switching...........................................................38
Entering the SLEEP Mode....................................................................................38
Entering the IDLE0 Mode .....................................................................................39
Entering the IDLE1 Mode .....................................................................................39
Standby Current Considerations...........................................................................39
Wake-up...............................................................................................................40
Programming Considerations ...............................................................................40
Watchdog Timer Clock Source .............................................................................41
Watchdog Timer Control Register.........................................................................41
Watchdog Timer Operation...................................................................................42
Reset Functions ...................................................................................................43
Reset Initial Conditions .........................................................................................44
BP ................................................................................................25
STATUS ...................................................................................26
TBLP, TBHP, TBLH.....................................................26
PCL..................................................................26
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LIRC .............................................................33
HIRC............................................................32