Measurement-computing CIO-DAS16/M1/16 Instrukcja Użytkownika Pobierz pdf (Strona 13)

5 REGISTER MAP

5.1 DAS16/M1/16 REGISTER MAP

Table 5-1. DAS16/M1/16 Register

Descriptions

8255 Control RegisterNone. No 8255 Read-backBASE+403h

8255 Port C Data8255 Port C DataBASE+402h

8255 Port B Data8255 Port B DataBASE+401h

8255 Port A Data8255 Port A DataBASE+400h

Pacer Clock (8254) ControlNone. No read back on 8254BASE +15

Counter 2 Data - A/D PacerCounter 2 Data - A/D Pacer ClockBASE + 14

Counter 1 Data - A/D PacerCounter 1 Data - A/D Pacer ClockBASE +13

Counter 0 Data - Residual CounterCounter 0 Data - Residual CounterBASE +12

Gain/Range Control, Res CTRGain/Range status, FFNE, Res CTRBASE + 11

Burst Length, Trigger, CTR1/TRG0 Burst Length, Trigger, CTR1/TRG0BASE + 10

Interrupt selection, Pacer/triggerInterrupt Enable/select, Pacer/triggerBASE + 9

Clear the interruptStatus, Mux settingBASE + 8

Not UsedNot UsedBASE + 7

Not UsedNot UsedBASE + 6

Not UsedNot UsedBASE + 5

Not UsedNot UsedBASE + 4

Digital Output Bits 0 to 3ID, Digital In 0 to 3, External ControlBASE + 3

Channel Mux read/Reset FIFOChannel Mux SetBASE + 2

Not UsedNot UsedBASE + 1

Software Start A/D ConversionA/D Data - 16 bits BASE

WRITE FUNCTIONREAD FUNCTIONADDRESS

The register map shown above is 8-bit transfers, except for BASE + 1 which is the A/D data register. It is for 16-bit

transfers only. This permits high-speed REP-INSW operation.

5.2 A/D DATA WORD REGISTER

BASE + 0 Example, 300h, 768 Decimal

AD0

LSB

AD1AD2AD3AD4AD5AD6AD7AD8AD9AD10AD11AD12AD13AD14

AD15

MSB

0132456789101112131415

A read/write register. The A/D Data Register is configured as a word because REP INSW can be used to quickly read

data from the board, allowing for higher A/D conversion rates than would be possible if using DMA, which accesses

the A/D data as two bytes.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 25 26

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Measurement-computing CIO-DAS16/M1/16 Instrukcja Użytkownika Strona 13