文档介绍：HT1621RAMMapping32´4LCDControllerforI/OMCUFeatures·Operatingvoltage:~·Built-in32´4bitdisplayRAM·Built-in256kHzRCoscillator·3-wireserialinterface··InternalLCDdrivingfrequencysourcesourceinput·Softwareconfigurationfeature·Selectionof1/2or1/3bias,andselectionof1/2or·mandmodeinstructions1/3or1/4dutyLCDapplications·R/Waddressautoincrement·Internaltimebasefrequencysources·essingmodes·Twoselectablebuzzerfrequencies(2kHz/4kHz)·VLCDpinforadjustingLCDoperatingvoltage·mandreducespowerconsumption·HT1621:48-pinSSOPpackage·Built-intimebasegeneratorandWDTHT1621B:48-pinDIP/SSOP/LQFPpackage·TimebaseorWDToverflowoutputHT1621D:28-pinSKDIPpackage·8kindsoftimebase/WDTclocksourcesHT1621G:Goldbumpedchip·32´4LCDdriverGeneralDescriptionTheHT1621isa128pattern(32´4),memorymapping,-andmulti--applicationsincludingLCDmodulesanddisplaysub--inOsc.¾ÖÖ¾ÖÖÖCrystalOsc.ÖÖ¾ÖÖÖÖ,3CircuitLCDDriver/WRBiasCircuitSEG0DATAVDDSEG31VSSVLCDBZToneFrequencyWatchdogTimerGeneratorandIRQBZTimeBaseGeneratorNote:CS:ChipselectionBZ,BZ:ToneoutputsWR,RD,DATA:3,SEG0~SEG31:LCDoutputsIRQ:TimebaseorWDToverflowoutputPinAssignmentSEG7148SEG8SEG7148SEG8SEG6247SEG9SEG6247SEG9SEG5346SEG10SEG5346SEG10SEG4445SEG11SEG4445SEG11SEG3544SEG12SEG3544SEG12SEG2643SEG13SEG2643SEG13SEG1742SEG14SEG1742SEG14SEG0841SEG15SEG0841SEG15CS940SEG16CS940SEG16RD1039SEG17RD1039SEG17WR1138SEG18WR1138SEG18SEG5128SEG7DATA1237SEG19DATA1237SEG19SEG3227SEG9VSS1336SEG20VSS1336SEG20SEG1326SEG11OSCO1435SEG21OSCO1435SEG21CS425SEG13NC1534SEG22OSCI1534SEG22RD524SEG15OSCI1633SEG23VLCD1633SEG23WR623SEG17VDD/2HT1621HT1621BHT1621D48SSOP-A48SSOP-A/DIP-A28SKDIP-,2003HT1621SSSSSSSSSSSSEEEEEEEEEEEEGGGGGGGGGGGG11012345678901484746454443424140393837CS136SEG12RD235SEG13WR334SEG14DATA433SEG15VSS532SEG16OSCO6HT1621