HT85F2240 datasheet(3/147 Pages) HOLTEK

3 / 147 page

Rev. 1.10

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A/D Flash 8051 Core Low Pin Count MCU

HT85F2230/HT85F2240

18 RAM Data Memory.............................................................................................. 41

Str�ct�re............................................................................................................................ 41

Register Banks.................................................................................................................. 44

Bit Addressab�e Space ...................................................................................................... 44

Specia� F�nction Registers................................................................................................ 46

ACC Register – Acc�m��ator........................................................................................................ 47

B Register .................................................................................................................................... 47

SP Register – Stack Pointer......................................................................................................... 47

DPL� DPH� DPL1� DPH1 Registers – Data Pointer Registers...................................................... 47

Data Pointer Se�ect Registers ...................................................................................................... 48

Data Pointer Contro� Register....................................................................................................... 48

Program Stat�s Word................................................................................................................... �0

19 Oscillators ........................................................................................................... 51

S�stem Osci��ator Overview .............................................................................................. �1

System Clock Configuration.............................................................................................. �1

Externa� High Speed Cr�sta� Osci��ator – HXT ............................................................................. �1

Interna� High Speed RC Osci��ator – HIRC................................................................................... ��

Interna� Low Speed RC Osci��ator – LIRC .................................................................................... ��

20 Operating Modes and System Clocks .............................................................. 53

S�stem C�ocks Description................................................................................................ ��

Operation Modes............................................................................................................... �7

NORMAL Mode ............................................................................................................................ �8

IDLE Mode.................................................................................................................................... �8

Power - Down Mode..................................................................................................................... �8

Power Contro� Register ..................................................................................................... �8

Standb� C�rrent Considerations ....................................................................................... �9

Wake-�p ............................................................................................................................ �9

21 Watchdog Timer.................................................................................................. 60

Watchdog Registers .......................................................................................................... 61

Watchdog Timer C�ock So�rce.......................................................................................... 64

Watchdog Timer Operation ............................................................................................... 64

22 Low Voltage Detector – LVD .............................................................................. 66

LVD Register ..................................................................................................................... 66

LVD Operation................................................................................................................... 66

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