HP 9112 Pacer Trigger Source, General Purpose Timer/ Counter, Address, 36 ∙ Operation Theorem

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Øevent counter

Øbinary rate multiplier

Øreal-time clock

ØDigital one-shot

Ømotor control

For more information about the 8254, please refer to the NEC Microprocessors and peripherals or Intel Microsystems Components Handbook.

Pacer Trigger Source

The counter 1 and counter 2 are cascaded together to generate the timer pacer trigger of A/D conversion. The frequency of the pacer trigger is software controllable. The maximum pacer signal rate is 2MHz/4=500K which excess the maximum A/D conversion rate of the PCI-9112. The minimum signal rate is 2MHz/65536/65536, which is a very slow frequency that user may never use it.

General Purpose Timer/ Counter

The counter 0 is free for users' applications. The clock source, gate control signal and the output signal is send to the connector CN3. The general purpose timer / counter can be used as event counter, or used for measuring frequency, or others functions.

I/O Address

The 8254 in the PCI-9112 occupies 4 I/O address as shown below.

BASE + 0	LSB OR MSB OF COUNTER 0
BASE + 1	LSB OR MSB OF COUNTER 1
BASE + 2	LSB OR MSB OF COUNTER 2
BASE + 3	CONTROL BYTE

The programming of 8254 is control by the registers BASE+0 to BASE+3. The functionality of each register is specified this section. For more detailed information, please refer handbook of 8254 chip.

36 ∙ Operation Theorem

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Contents Page ALL Rights Reserved TrademarksQuestions Adlink Technology IncDetailed Company Information Page Contents Conversion Conversion Digital Input and Output9112DO 9112DA 9112ADSetChannel 9112ADSetRange 9112DblBufferTransfer 9112GetOverrunStatusAppendix A. Demo. Programs Product Warranty/Service What do you need VR Assignment AdjustmentSoftware Utilities PCI Scan UtilityHow to Use This Guide Introduction ∙ FeaturesT r o d u c t i o n Specifications ApplicationsAnalog Input A/D Analog Output D/AProgrammable Counter General SpecificationsDigital I/O DIO PCIS-LVIEW LabVIEW Driver Software SupportingProgramming Library PCIS-VEE HP-VEE Driver DAQBenchTM ActiveX ControlsDASYLabTM PRO PCIS-DDE DDE Server and InTouchTMWhat You Have Installation∙ Installation Unpacking Device Installation for Windows SystemsInstallation ∙ PCB Layout PCI-9112 LayoutConverter PCI -Bus ControllerCPCI-9112 Layout PCB Layout of the PCI-911210 ∙ Installation Jumper SettingsAnalog Input Channel Configuration Clock Source Setting D/A Reference Voltage SettingInternal Reference Voltage Setting 12 ∙ InstallationPin Assignments of PCI-9112 Connectors Pin AssignmentsCN 3 Analog Input / Output & Counter/Timer 14 ∙ Installation CN 1 Digital Signal Input DI 0CN 2 Digital Signal Output do 0 Pin Assignments of cPCI-9112 Hardware Installation Outline 16 ∙ InstallationDaughter Board Connection Connect with ACLD-8125Connect with ACLD-9137 Connect with ACLD-9182Connect with ACLD-9138 and ACLD-9188 18 ∙ InstallationConnect with ACLD-9185 Registers Format ∙ G i s t e r s F o r m a tI/O Registers Map A/D Data Registers 20 ∙ Registers FormatD/A Output Register 22 ∙ Registers Format A/D control RegisterMode Auto-Scan Bit MUX Register Bit8 ~ Bit524 ∙ Registers Format A/D Status Register Software Trigger RegisterDigital I/O register 26 ∙ Registers FormatLow Level Programming Internal Timer/Counter RegisterHigh Level Programming Analog Input Signal Connection E r a t i o n T h e o r e mA/D Conversion 28 ∙ Operation TheoremOperation Theorem ∙ Single-ended ModeDifferential input mode 4 Floating source and differential input 30 ∙ Operation Theorem1 A/D Conversion Procedure Timer Pacer Trigger2 A/D Trigger Modes Software trigger3 A/D Data Transfer Modes External TriggerSoftware Data Transfer Drdy Interrupt Transfer Intx D/A Conversion DMA Transfer DmaxDigital Input and Output 34 ∙ Operation TheoremTimer/Counter Operation CounterGeneral Purpose Timer/ Counter Pacer Trigger SourceAddress 36 ∙ Operation TheoremControl Byte Mode Definitions 38 ∙ Operation Theorem++ Library ∙ Libraries Installation+ + L i b r a r y Programming Guide Naming ConventionData Types 40 ∙ C/C++ Library9112Initial SyntaxArgument Return Code9112DI 9112DI ChannelDescription 42 ∙ C/C++ Library9112DO 9112DA 44 ∙ C/C++ Library9112ADSetChannel 9112ADSetRange 46 ∙ C/C++ Library10 9112ADSetMode Cardnumber the card number of PCI-911211 9112ADSetAutoscan 48 ∙ C/C++ Library12 9112ADSoftTrig 13 9112ADAquire 50 ∙ C/C++ Library14 9112ADDMAStart 52 ∙ C/C++ Library 15 9112ADDMAStatus 16 9112ADDMAStop 54 ∙ C/C++ Library17 9112ContDmaStart 18 9112CheckHalfReady 56 ∙ C/C++ Library19 9112DblBufferTransfer 20 9112GetOverrunStatus21 9112ContDmaStop 58 ∙ C/C++ Library22 9112ADINTStart 23 9112ADINTStatus 60 ∙ C/C++ Library25 9112ADTimer 24 9112ADINTStop2MHz / c1 * c2 62 ∙ C/C++ Library26 9112TIMERStart 27 9112TIMERRead28 9112TIMERStop 29 9112AllocDMAMemArgument cardnumber countervalue 64 ∙ C/C++ Library30 9112FreeDMAMem 32 9112GetSample66 ∙ C/C++ Library Calibration ∙ CalibrationWhat do you need A/D Adjustment VR AssignmentBipolar Calibration Unipolar Calibration2 D/A Channel Calibration D/A AdjustmentReference Voltage Calibration 70 ∙ Software Utility Software UtilitiesSoftware Utility System Configuration Running the UtilityCalibration Software Utility ∙72 ∙ Software Utility Functional TestingPCI Scan Utility P e n d i x a . D e m o O g r a m s DOS SoftwareWindows 95 DLL Appendix a Demo Programs ∙74 ∙ Appendix a Demo Programs Product Warranty/Service Product Warranty/Service ∙