Intel UPI-L42 UPI-C42-8243 Keyboard Scanner, UPI-C42 80-Column Matrix Printer Interface

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APPLICATIONS (Continued)

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Figure 9. 8048H-UPI-C42 Interface

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Contents Configuration DIP PinUPI-C42/UPI-L42 Pin DescriptionBlock Diagram Intel 82C42 UPI-C42 Low power Chmos version of the UPI-42UPI-C42/L42 Product Selection Guide UPI-L42 The low voltage 3.3V version of the UPI-C42IBF OBF UPI-42 Compatible FeaturesBits of Status Interrupt Routines Program Memory Bank SwitchUPI-C42 Features Suspend Mode Summary SuspendRDÝ, WRÝ NEW UPI-C42 InstructionsNew Instructions XTAL1, XTAL2BUS Programming and Verifying the UPI-C42Xtal ProgSecurity BIT Quick-Pulse Programming AlgorithmVerify Security BIT PROGRAMMING/ VerificationVerification Signature ModeSync Mode Access Code Sync Mode Timing Diagrams ApplicationsUPI-C42-8243 Keyboard Scanner UPI-C42 80-Column Matrix Printer InterfaceAbsolute Maximum Ratings XTAL2, ResetRESET, SS UPI-C42 UPI-L42DC Characteristics DBB Write AC CharacteristicsDBB Read Clock AC Characteristics DMAAC Characteristics Port AC CHARACTERISTICS-PROGRAMMING UPI-C42 and UPI-L42 AC Testing INPUT/OUTPUT Waveform AC Testing Load CircuitLC Oscillator Mode Crystal Oscillator Mode Driving from AN External SourceWrite OPERATION-DATA BUS Buffer Register WaveformsRead OPERATION-DATA BUS Buffer Register Clock TimingWaveforms Combination PROGRAM/VERIFY ModeVerify Mode Port Port Timing During External Access EADMA UPI Instruction Set AccumulatorRevision Summary Jmpp @A