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HT66F20 Datasheet(PDF) 242 Page - Holtek Semiconductor Inc |
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HT66F20 Datasheet(HTML) 242 Page - Holtek Semiconductor Inc |
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242 / 298 page  Rev. 1.90 �4� �e���a�� 18� �01� Rev. 1.90 �4� �e���a�� 18� �01� HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM HT66F20/HT66F30/HT66F40/HT66F50/HT66F60 HT66FU30/HT66FU40/HT66FU50/HT66FU60 Enhanced A/D Flash Type 8-Bit MCU with EEPROM SC K SD I SD O VD D SC S IN T CL KI GN D SC K SD O SD I PC K SC S VD D GN D MC U RX TX PI NT UART M odu le V DD MCU to UART Internal Connection UART Module SPI Interface TheMCUcommunicateswiththeUARTModuleviaaninternalSPIinterface.TheSPIinterfaceon thisdeviceiscomprisedoffoursignals:SCS(SPIChipSelect),SCK(SPIClock),SDI(SerialData Input)andSDO(SerialDataOutput).TheSPImaster,whichistheMCU,assertsSCSbypullingit lowtostartthedatatransactioncycle.Whenthefirst8bitsofdataaretransmitted,SCSshouldnot returntoahighlevel.Instead,SCSmustremainatalowleveluntilthewhole16-bitdatatransaction iscompleted.IfSCSisde-asserted,thatisreturnedtoahighlevelbeforethe16-bitdatatransaction iscompleted,alldatabitswillbediscardedbytheUARTModuleSPIslave. SPI Timing BothreadandwriteoperationsareconductedalongtheSPIcommoninterfacewiththefollowing format: • WriteTypeFormat:8-bitcommandinput+8-bitdatainput • ReadTypeFormat:8-bitcommandinput+8-bitdataoutput SDO SDI SCK SCS A7 A6 A5 A4 A� A� A1 A0 D7 D6 D5 D4 D� D� D1 D0 Writing Type Format: 8-bit Command Input + 8-bit Data Input SDO SDI SCK SCS A7 A6 A5 A4 A� A� A1 A0 D7 D6 D5 D4 D� D� D1 D0 tw Reading Type Format: 8-bit Command Input + 8-bit Data Output |
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