Measurement-computing CIO-DAS160x/1x Manual de usuario descargar pdf (Pagina 24)

Table 6-1. Register Map

NoneStatus of extended featuresBASE + 407h

DAS 1600 Enable/DisableNoneBASE + 406h

Burst Mode Enable/DisableNoneBASE + 405h

Conversion Enable/DisableNoneBASE + 404h

Configure 8255, n/a on -P5 ver.None. No read back on 8255BASE + 403h

Port C Output, n/a on -P5 ver.Port C InputBASE + 402h

Port B Output, n/a on -P5 ver.Port B InputBASE + 401h

Port A Output, n/a on -P5 ver.Port A Input of 8255BASE + 400h

Pacer Clock Control (8254)None. No read back on 8254BASE + Fh

CTR 2 Data - A/D PacerCTR 2 Data - A/D Pacer ClockBASE + Eh

CTR 1 Data - A/D PacerCTR 1 Data - A/D Pacer ClockBASE + Dh

Counter 0 DataCounter 0 DataBASE + Ch

PGA Control/DT resetPGA gain BASE + Bh

Burst Length/pacer clk cntrlnoneBASE + Ah

Set DMA, INT etcDMA, Interrupt & Trigger

Control

BASE + 9

Clear InterruptStatus EOC, UNI/BIP etc.BASE + 8

D/A 1 Most Significant bitsNoneBASE + 7

D/A 1 Least Significant bitsNoneBASE + 6

D/A 0 Most Significant bitsNoneBASE + 5

D/A 0 Least Significant bitsNoneBASE + 4

Digital 4 Bit OutputDigital 4-Bit InputBASE + 3

Channel MUX / FIFO resetChannel MUX BASE + 2

NoneA/D Data (Most significant)BASE + 1

Start A/D ConversionA/D Data (Least significant) BASE

WRITE FUNCTIONREAD FUNCTIONADDRESS

6.1.1 A/D DATA & CHANNEL REGISTERS (CIO-DAS1600/12)

BASE ADDRESS +0

CH0CH1CH2CH3A/D 0

LSB

A/D 1A/D 2A/D 3

01234567

A read/write register.

READ

On read, it contains two types of data. The least significant four digits of the analog input data and the

channel number from which the current data was taken.

These four bits of analog input data must be combined with the eight bits of analog input data in BASE +

1 to form a complete 12-bit number. The data format is 0 =

−

FS; 4095 = +FS.

The channel number is binary. If the current channel is 5, bits CH2 and CH0 are high, CH3 and CH1 are

low.

WRITE

Writing any data to the register causes an immediate A/D conversion.

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 43 44

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