Advantech PCM-3780 manual Mode E Waveforms, Rate Generator with Level Gating

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D.6 Mode E Waveforms

Rate Generator with Level Gating

Mode E is identical to Mode D, except the counter will only count those source edges that occur while the gate input is active. This feature allows the counting process to be enabled and disabled under hardware control. A square wave rate generator may be obtained by specifying the TC tog- gled output mode.

SOURCE

GATE

COUNT

2

1

0

L

L-1

L-2

K+1

K

K-1

2

1

0

L

VALUE

TC OUTPUT

TC TOGGLED

OUTPUT

Mode E Waveforms

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AppendixD

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Contents PCM-3780 Ch Counter/Timer with Ch TTL DIO ModuleCopyright Acknowledgements Two Years Product Warranty CE Notification FCC Class a Technical Support and Assistance Packing List Page Contents Appendix Specifications Introduction Features Counter Modes PCM-3780 Counter ModePCM-3780 Counter Mode Applications Installation GuideInstallation Flow Chart Register-level Programming Software OverviewDevice Drivers on the companion CD-ROM Device DriversProgramming Tools Device Drivers Programming RoadmapProgramming with Device Drivers Function Library Troubleshooting Device Drivers ErrorWiring Boards AccessoriesWiring Cables Hardware Installation Unpacking Companion CD-ROM Driver InstallationDifferent Options for Driver Setup Installing the Module Hardware InstallationPage Pin Assignments & Jumper Settings Overview Signal ConnectionsInterrupt Level IRQ Setting JP1 Switch and Jumper SettingsBase Address Setting Base Address Setting SW1CN4 Counter Interface Connector Connectors Pin AssignmentCN3 I/O Port Connector Reference Direction Description Connector Signal DescriptionPeriod Measurement Using Advantech 32-bit DLL DriverUsing Direct I/O Frequency Measurement Frequency MeasurementSpecifications Digital Input/Output Programmable CounterGeneral Page Block Diagram Appendix B Block Diagram Register Structure & Format I/O Port Address Map Appendix C Register Structure & FormatTable C.1 Register Offset Address Table Register FormatCE CE CM6 to CM3 Count Control CM6 Counter 0/1 Mode RegisterCM2 Output Enable Control CM1 to CM0 Output ControlCM15 Gate Active Edge or Level CM7 Count Source EdgeCM13 to CM12 Gate Source Selection CM14 Gating Polarity SelectionCounter 0/1 Hold Register Counter 0/1 Load RegisterCE1 to CE0 Counter Command Enable Bit Counter 0/1 Command RegisterCounter Command Enable Register C2 to C0 Command CodeInterrupt Status Register Interrupt Control RegisterO Direction Control Bit Interrupt Clear RegisterDirection Control Register Port A/B/C Interrupt Status RegisterDV3 to DV0 Fout Divider Divide by 1 to 16 0000 = Divide by Fout RegisterFS2 to FS0 Fout Source FOE Fout Output EnableWaveform of Each Mode Counter Mode Descriptions Appendix D Waveform of Each ModeTable D.1 PCM-3780 Counter Mode Table D.2 PCM-3780 Counter Mode Software-Triggered Strobe with No Hardware Gating Mode a WaveformsSoftware-Triggered Strobe with Level Gating Mode B WaveformsHardware-Triggered Strobe Mode C WaveformsRate Generator with No Hardware Gating Mode D WaveformsRate Generator with Level Gating Mode E WaveformsNon-Retriggerable One-Shot Mode F WaveformsSoftware-Triggered Delayed Pulse One-Shot Mode G WaveformsMode H Waveforms Hardware-Triggered Delayed Pulse Strobe Mode I WaveformsVariable Duty Cycle Rate Generator with No Hardware Gating Mode J WaveformsVariable Duty Cycle Rate Generator with Level Gating Mode K WaveformsHardware-Triggered Delayed Pulse One-Shot Mode L WaveformsHardware-Triggered Strobe with Edge Disarm Mode O WaveformsNon-Retriggerbale One-Shot with Edge Disarm Mode R WaveformsHardware-Triggered Delayed Pulse Strobe with Edge Disarm Mode U WaveformsHardware-Triggered Delayed Pulse One-Shot with Edge Disarm Mode X Waveforms