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Omega OME-A822PG 1.3.7 Programmable Timer/Counter , 1.3.8 Direct Memory Access Channel (DMA)

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1.3.7 Programmable Timer/Counter

z Type : 82C54 -8 programmable timer/counter

z Counters : Counter1 and counter2 are cascaded as a 32 bit pacer timer.

Counter0 is a user available timer/counter. The software driver also uses

counter0 to implement a machine independent timer.

z Clock input frequency : DC to 10 MHz

z Pacer output : 0.00047Hz to 0.5MHz

z Input ,gate : TTL compatible

z Internal Clock : 2 MHz

1.3.8 Direct Memory Access Channel (DMA)

z Level : CH1 or CH3, jumper selectable

z Enable : via DMA bit of control register

z Termination : by interrupt on T/C

z Transfer rate : 100K conversions/sec.

OME-A-822PGL/PGH Hardware Manual ---- 7

Contents

Main Servicing North America: USA: Canada: For immediate technical or application assistance: USA and Canada: OME-A-822PGH/PGL Page Page 1. Introduction 1.1 General Description 1.2 Features 1.3 Specifications 1.3.1 Power Consumption : 1.3.2 Analog Inputs Caution: refer to Sec. 2.9 first 1.3.3 A/D Converter 1.3.4 DA Converter 1.3.5 Digital I/O 1.3.6 Interrupt Channel 1.3.7 Programmable Timer/Counter 1.3.8 Direct Memory Access Channel (DMA) 1.4 Applications 1.5 Product Check List Attention ! 2. Hardware Configuration 2.1 Board Layout 2.2 I/O Base Address Setting SW1 : BASE ADDRESS 2.3 Jumper Settings 2.3.1 JP1 : D/A Internal Reference Voltage Selection 2.3.2 JP2 : D/A Int/Ext Ref Voltage Selection 2.3.3 JP3 : Single-ended/Differential Selection Refer to Sec. 2.9 first. 2.3.4 JP4 : A/D Trigger Source Selection 2.3.5 JP5 : Interrupt Level Selection 2.3.6 JP6 : User Timer/Counter Clock Input Selection NOTE : if you use A-822_Delay(), the JP6 jumper must be set to internal 2M clock. 2.3.7 JP7 : DMA DACK Selection, JP8 : DMA DRQ Selection 2.4 I/O Register Address 2.4.1 8254 Counter 2.4.2 A/D Input Buffer Register 2.4.3 D/A Output Latch Register NOTE : Send the low 8 bits first, then send the high 4 bits. 2.4.4 D/I Input Buffer Register 2.4.5 Clear Interrupt Request 2.4.6 A/D Gain Control Register NOTE : OME-A-822PGL GAIN CONTROL CODE TABLE OME-A-822PGH GAIN CONTROL CODE TABLE 2.4.7 A/D Multiplex Control Register 2.4.8 A/D Mode Control Register 2.4.9 A/D Software Trigger Control Register 2.4.10 D/O Output Latch Register 2.5 Digital I/O 2.6 8254 Timer/Counter 2.7 A/D Conversion 2.7.1 A/D conversion flow 2.7.2 A/D Conversion Trigger Modes 2.7.3 A/D Transfer Modes 2.7.4 Using software trigger and polling transfer 2.8 D/A Conversion send the low byte data first, then send the high byte data 2.9 Analog Input Signal Connection Page Page Figure 4 Signal Shielding 2.10 Using OME-DB-8225 CJC Output 3. Connector 3.1 CN1/CN2/CN3 Pin Assignment SINGLE-ENDED SIGNAL MODE DIFFERENTIAL SIGNALS 3.2 Daughter Board 3.2.1 OME-DB-8225 3.2.2 OME-DB-37 3.2.3 OME-DB-16P 3.2.4 OME-DB-16R 4. Calibration 4.1 Description of Variable Resistors 4.2 D/A Calibration 4.3 A/D Calibration 5. Diagnostic Utility 5.1 Introduction Page 5.2 Running The Diagnostic Utility 5.2.1 Setup Page 5.2.2 CALIBRATION 5.2.3 FUNCTION TEST Page Page Page Page Page Page Page 5.2.4 SPECIAL TEST Page WARRANTY/DISCLAIMER RETURN REQUESTS/INQUIRIES M4031/0104 Where Do I Find Everything I Need for Process Measurement and Control? OMEGAOf Course! Shop online at www.omega.com TEMPERATURE PRESSURE, STRAIN AND FORCE FLOW/LEVEL pH/CONDUCTIVITY