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HT82B42R Datasheet(PDF) 51 Page - Holtek Semiconductor Inc |
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HT82B42R Datasheet(HTML) 51 Page - Holtek Semiconductor Inc |
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51 / 86 page  Rev. 1.00 50 October 27, 2011 Rev. 1.00 51 October 27, 2011 HT82B42R/HT82B42RE I/O MCU with USB Interface ThereisasystemclockcontrolregisterimplementtoselecttheclockusedintheMCU.Thisregister consistersoftheUSBclocksontrolbit,USBCKEN,secondsuspendmodecontrolbit,SUSP2,and asystemcolckselectionbit,SYSCLK.ThePS2modeindicatebit,PS2_flag,andasystemclock adjustcontrolbit,CLK_adj. SCC Register Bit 7 6 5 4 3 2 1 0 Name CLK_adj SYSCLK PS2_flag SUSP2 USBCKEN ― ― ― R/W R/W R/W R/W R/W R/W ― ― ― POR 0 0 0 0 0 ― ― ― Bit7 CLK_adj:USBmodesystemclockadjustment 0:enable(default) 1:disable ThisbitisusedtoadjustthesystemclockfortheUSBmodefortemperaturechanges. InthePower-downModethisbitshouldbesethightoreducepowerconsumption. Bit6 SYSCLK:SpecifyMCUoscillatorfrequencyindicationbit 0:12MHzcrystaloscillatororresonator,clearthisbitto“0” 1:6MHzcrystaloscillatororresonator,setthisbitto“1” ThisbitisusedtospecifythesystemoscillatorfrequencyusedbytheMCU.Ifan Integrated6MHzoscillatorisused,thisbitshouldbesetto“1”.IfanIntegrated 12MHzoscillatorisused,thisbitshouldbeclearedto“0”(default). Bit5 PS2_flag:PS2modeindicationbit 0:notPS2mode 1:PS2mode ThisflagisusedtoindicatethattheMCUisinthePS2mode.(Bit=1) ThisbitisR/WbyFWandwillbeclearedto“0”afterpower-onreset.(Default="0") Bit4 SUSP2:Reducepowerconsumptioninsuspendmodecontrolbit 0:innormalmode 1:inhaltmode,setthisbitto“1”forreducingpowerconsumption Bit3 USBCKEN:USBclockcontrolbit 0:disable 1:enable Bit2~0 Unimplemented STALL and PIPE, PIPE_CTRL, Endpt_EN Registers ThePIPEregisterrepresentswhetherthecorrespondingendpointisaccessedbythehostornot. AfteranACT_ENsignalhasbeensentout,theMCUcancheckwhichendpointhadbeenaccessed. Thisregisterissetonlyaftertheatimewhenthehostisaccessingthecorrespondingendpoint. TheSTALLregistershowswhetherthecorrespondingendpointworksornot.Assoonasthe endpointworksimproperly,thecorrespondingbitmustbeset. ThePIPE_CTRLRegisterisusedforconfiguringtheIN(Bit=1)orOUT(Bit=0)Pipe.Thedefault isdefineINpipe.Bit0(DATA0)ofthePIPE_CTRLRegisterisusedtosetthedatatoggleofany endpoint(exceptendpoint0)usingdatatogglestothevalueDATA0.Oncetheuserwantsany endpoint(exceptendpoint0)usingdatatogglestothevalueDATA0.theusercanoutputaLOW pulsetothisbit.TheLOWpulseperiodmustatleast10instructioncycles. TheEndpt_ENRegisterisusedtoenableordisablethecorrespondingendpoint(exceptendpoint0) EnableEndpoint(Bit=1)ordisableEndpoint(Bit=0) |
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