HT85F2240 datasheet(4/147 Pages) HOLTEK

4 / 147 page

Rev. 1.10

4 of 147

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A/D Flash 8051 Core Low Pin Count MCU

HT85F2230/HT85F2240

23 Reset and Initialisation....................................................................................... 67

Reset Overview................................................................................................................. 67

Reset Operations .............................................................................................................. 68

Reset So�rce Register – RSTSRC............................................................................................... 68

Power-on Reset............................................................................................................................ 69

RESET Pin Reset......................................................................................................................... 70

Low Vo�tage Reset – LVR............................................................................................................. 71

Watchdog Reset .......................................................................................................................... 7�

Software Resets ........................................................................................................................... 7�

SRST Register Software Reset.................................................................................................... 7�

WDTCR Register Software Reset ................................................................................................ 7�

LVRCR Register Software Reset.................................................................................................. 74

Reset Initia� Conditions...................................................................................................... 74

24 Interrupts............................................................................................................. 79

Interr�pt Registers............................................................................................................. 79

Interr�pt Operation ............................................................................................................ 8�

Interr�pt Priorit�................................................................................................................. 86

Priorit� Leve�s............................................................................................................................... 86

Priorit� Contro� Registers.............................................................................................................. 87

Externa� Interr�pt............................................................................................................... 90

A/D Converter Interr�pt ..................................................................................................... 90

Timer/Co�nter Interr�pt ..................................................................................................... 90

Time Base Interr�pts ......................................................................................................... 91

LVD Interr�pt ..................................................................................................................... 9�

Interr�pt Wake-�p F�nction............................................................................................... 9�

Programming Considerations............................................................................................ 9�

25 Input/Output Ports.............................................................................................. 94

Inp�t/O�tp�t Port Overview............................................................................................... 94

Register Description.......................................................................................................... 9�

PnM0/PnM1 Registers – Port Mode Registers............................................................................. 96

P0WAKE Register – Port 0 Wake-�p ........................................................................................... 98

SRCR Register – S�ew Rate Contro�............................................................................................ 99

Pin-remapping F�nction .................................................................................................... 99

PRM Register – Pin-remapping Contro� Register......................................................................... 99

I/O Pin Str�ct�res............................................................................................................ 100

Q�asi-bidirectiona� I/O ............................................................................................................... 100

P�sh-p�� O�tp�t ........................................................................................................................ 101

Open-drain O�tp�t ..................................................................................................................... 101

Inp�t On�� .................................................................................................................................. 101

Programming Considerations.......................................................................................... 10�

HT85F2240 Datasheet(PDF) 4 Page - Holtek Semiconductor Inc

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