HT85F2270 datasheet(4/226 Pages) HOLTEK

4 / 226 page

Rev. 1.00

4 of ��6

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Standard 8051 8-Bit Flash MCU

HT85F2260/HT85F2270/HT85F2280

23 Low Voltage Detector – LVD .............................................................................. 75

LVD Register ..................................................................................................................... 7�

LVD Operation................................................................................................................... 7�

24 Reset and Initialisation....................................................................................... 76

Reset Overview................................................................................................................. 76

Reset Operations .............................................................................................................. 77

Reset Source Register – RSTSRC............................................................................................... 77

Power-on Reset............................................................................................................................ 78

RESET Pin Reset......................................................................................................................... 79

Low Voltage Reset – LVR............................................................................................................. 80

Watchdog Reset .......................................................................................................................... 81

�issing Clock Detect Reset.......................................................................................................... 8�

Comparator 0 Reset ..................................................................................................................... 8�

Software Resets ........................................................................................................................... 84

SRST Register Software Reset.................................................................................................... 84

WDTCR Register Software Reset ................................................................................................ 8�

LVRCR Register Software Reset.................................................................................................. 8�

RO� Code Check Reset.............................................................................................................. 86

Reset Initial Conditions...................................................................................................... 86

25 Interrupts............................................................................................................. 92

Interrupt Registers............................................................................................................. 9�

Interrupt Operation .......................................................................................................... 104

Interrupt Priorit�............................................................................................................... 107

Priorit� Levels............................................................................................................................. 107

Priorit� Control Registers............................................................................................................ 109

External Interrupt............................................................................................................. 11�

Comparator Interrupt....................................................................................................... 11�

A/D Converter Interrupt ................................................................................................... 114

Timer/Counter Interrupt ................................................................................................... 114

Time Base Interrupts ....................................................................................................... 114

I�C Interface Interrupt ...................................................................................................... 11�

SPI Interface Interrupt ..................................................................................................... 116

UART Interface Interrupt ................................................................................................. 116

LVD Interrupt ................................................................................................................... 116

Interrupt Wake-up Function............................................................................................. 117

Programming Considerations.......................................................................................... 117

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