Diamond Systems RUBY-MM-1612 user manual Register Definitions, Base + 0, Write DAC LSB register

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7. REGISTER DEFINITIONS

Base + 0, Write: DAC LSB register

Bit No.	7	6		5	4	3	2	1	0

Name	DA7	DA6		DA5	DA4	DA3	DA2	DA1	DA0

DA7-0	D/A data bits 7-0. DA0 is the LSB (least significant bit).
Base + 1, Write: DAC MSB register

Bit No.	7	6		5	4	3	2	1	0

Name	X	X		X	X	DA11	DA10	DA9	DA8

X	Bit not used. These bits will be ignored.
DA11-8	D/A data bits 11-8. DA11 is the MSB (most significant bit).

Base + 0 or 1, Read: Update DACs

Reading from these locations updates all DACs to the values written to them. Only DACs with new data written to them will change. The remaining channels will retain their current values.

Base + 2, Write: DAC channel register

Bit No.	7	6		5	4	3	2	1	0

Name	X	X		X	X	CH3	CH2	CH1	CH0

X	Bit not used. These bits will be ignored.
CH3-0	D/A Channel no. There are 16 channels numbered 0 to 15.

Copyright 2001 Diamond Systems Corp.

Ruby-MM-1612 User Manual V1.1 P. 10

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Contents

RUBY-MM-1612 Table of Contents Description Signal Name Definition O Header PinoutBase Address Configuration Header J5 Position Hex Decimal Board ConfigurationBase Address On-Board Reference Full-Scale Voltage Selection Analog Output Range ConfigurationAdjustable Reference Voltage Full-Scale VoltageAnalog Output Configuration Header J4 Range RUBY-MM-1612 Board Drawing Ruby-MM-1612 I/O Map Reset informationBase + Write Function Read Function Base + 0, Write DAC LSB register Base + 0 or 1, Read Update DACsRegister Definitions Base + 1, Write DAC MSB registerBase + 3, Write External trigger register 82C55 Register Map Configuration Register82C55 Digital I/O Chip Operation DefinitionsFull Scale 1LSB Analog Output Ranges and ResolutionFull Scale 10. D/A Code Computation LSB = 1/2048 x Full-Scale Voltage Offset Binary Coding for bipolar output rangesOutput Code Explanation Output Voltage for ±5V Range Hardware Update Command HOW to Generate AN Analog OutputTo generate an analog output on one or more channels Examples Single channel output Two channel outputCalibration Procedure Specifications MiscellaneousDescription FeaturesOrdering Information PinoutsFunctional Diagram 82C55A Pin DescriptionRead/Write and Control Logic 82C55A Functional DescriptionData Bus Buffer Group a and Group B ControlsOperational Description Mode Selection82C55A Ports A, B, and CInterrupt Control Functions Single Bit Set/Reset Feature FigureOperating Modes Inte Flip-Flop DeﬁnitionMode 0 Basic Output Mode 0 Basic InputMode 0 Conﬁgurations Control Word #4 Control Word #8 STB Strobe Input Input Control Signal DeﬁnitionIBF Input Buffer Full F/F Output Control Signal Deﬁnition Intr Interrupt RequestOutput Operations Mode 2 Strobed Bi-Directional Bus I/OBi-Directional Bus I/O Control Signal Deﬁnition Input OperationsMode Control Word Mode 2 Combinations Special Mode Combination Considerations Current Drive CapabilityApplications of the 82C55A Reading Port C Status Figures 15