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HT45R4U Datasheet(PDF) 30 Page - Holtek Semiconductor Inc |
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HT45R4U Datasheet(HTML) 30 Page - Holtek Semiconductor Inc |
30 / 105 page Rev. 1.10 30 �a��� 1�� �01� Rev. 1.10 31 �a��� 1�� �01� HT45R4U TinyPowerTM A/D Type e-Banking ASSP OTP MCU with LCD I/O Port Control Registers EachI/OporthasitsowncontrolregisterknownasPAC,PBC,PDCandPEC,tocontroltheinput/ outputconfiguration.Withthiscontrolregister,eachCMOSoutputorinputwithorwithoutpull- highresistorstructurescanbereconfigureddynamicallyundersoftwarecontrol.EachpinoftheI/O portsisdirectlymappedtoabitinitsassociatedportcontrolregister.FortheI/Opintofunctionas aninput,thecorrespondingbitofthecontrolregistermustbewrittenasa″1″.Thiswillthenallow thelogicstateoftheinputpintobedirectlyreadbyinstructions.Whenthecorrespondingbitofthe controlregisteriswrittenasa″0″,theI/OpinwillbesetupasaCMOSoutput.Ifthepiniscurrently setupasanoutput,instructionscanstillbeusedtoreadtheoutputregister.However,itshouldbe notedthattheprogramwillinfactonlyreadthestatusoftheoutputdatalatchandnottheactual logicstatusoftheoutputpin. PAC Register Bit 7 6 5 4 3 2 1 0 Name D7 D6 D� D4 D3 D� D1 D0 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 1 1 1 1 1 1 1 1 PBCRegister Bit 7 6 5 4 3 2 1 0 Name D7 D6 D� D4 D3 D� D1 D0 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 1 1 1 1 1 1 1 1 PCC Register Bit 7 6 5 4 3 2 1 0 Name D7 D6 D� D4 D3 D� D1 D0 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 1 1 1 1 1 1 1 1 PDC Register Bit 7 6 5 4 3 2 1 0 Name D7 D6 D� D4 D3 D� D1 D0 R/W R/W R/W R/W R/W R/W R/W R/W R/W POR 1 1 1 1 1 1 1 1 Bit7~0 I/OPortbit7~bit0Input/OutputControl 0:output 1:input PEC Register Bit 7 6 5 4 3 2 1 0 Name — — — — — — D1 D0 R/W — — — — — — R/W R/W POR — — — — — — 1 1 Bit7~2 Unimplemented,readas"0" Bit1~0 PortEbit1~bit0Input/OutputControl 0:output 1:input |
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