HT67F5652 datasheet(152/224 Pages) HOLTEK

152 / 224 page

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HT67F5652

24-Bit Delta Sigma A/D + LCD Flash MCU

HT67F5652

24-Bit Delta Sigma A/D + LCD Flash MCU

I2C Time Out function

InordertoreducetheI2Clockupproblemduetoreceptionoferroneousclocksources,atime-out

functionisprovided.IftheclocksourceconnectedtotheI2Cbusisnotreceivedforawhile,then

theI2CcircuitryandtheSIMC1registerwillbereset,theSIMTOFbitintheSIMTOCregisterwill

besethighafteracertaintime-outperiod.TheTimeOutfunctionenable/disableandthetime-out

periodaremanagedbytheSIMTOCregister.

• I2C Time Out operation

Thetime-outcounterstartstocountonanI2Cbus"START"&"addressmatch"condition,andis

clearedbyanSCLfallingedge.BeforethenextSCLfallingedgearrives,ifthetimeelapsedis

greaterthanthetime-outperiodspecifiedbytheSIMTOCregister,thenatime-outconditionwill

occur.Thetime-outfunctionwillstopwhenanI2C"STOP"conditionoccurs.Thereare64time-out

periodselectionswhichcanbeselectedusingtheSIMTOS0~SIMTOS5bitsintheSIMTOCregister.

I C ti me - out

c oun te r st ar t

I C ti me - out c oun te r re se t

on SC L negat iv e tr ans it io n

01010

SC L

St ar t

SD A

SR W

AC K

St op

SC L

SD A

Sl av e Ad dr es s

I2C Time-out Diagram

WhenanI2Ctime-outcounteroverflowoccurs,thecounterwillstopandtheSIMTOENbitwill

beclearedtozeroandtheSIMTOFbitwillbesethightoindicatethatatime-outconditionhas

occurred.WhenanI2Ctime-outoccurs,theI2Cinternalcircuitrywillberesetandtheregisterswill

beresetintothefollowingcondition:

After I2C Time-out

SIMD� SIMA� SIMC0

No �hange

SIMC1

Reset to POR �ondition

I2C Registers after Time-out

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