Measurement-computing CIO-DAS6402/12 Manual de usuario descargar pdf (Pagina 21)

5.4 8-BIT DIGITAL I/O REGISTERS

BASE ADDRESS +3 Example, 303h, 771 Decimal

READ

DI0

XPACER

DI1

XTRIG

DI2

GATE0

DI3DI4DI5DI6DI7

01324567

The signals present at the 8 digital inputs are read as one byte. Three of the pins have special functions in addition to digital input.:

XPACER/DI0 External Pacer: Starts an A/D Conversion on each active edge.

XTRIG/DI1 External Trigger: Causes an entire acquisition to start or stop.

GATE0/DI2 Gate for CTR0 Used in Compatible mode only.

These special functions are optionally enabled in software, and are explained below. External Interrupt is enabled at BASE +9,

External Pacer and External Trigger are enabled at BASE +10. Please see those register descriptions for details.

WRITE

DO0DO1DO2DO3DO4DO5DO6DO7

01324567

All of the eight bits are latched TTL outputs.

5.5 DIGITAL TO ANALOG CONVERTER (ANALOG OUT) REGISTERS

D/A 0 REGISTERS

BASE ADDRESS +4 Example, 304h, 772 Decimal

D/A0D/A1D/A2D/A3D/A4D/A5D/A6D/A716-BIT

0000D/A0D/A1D/A2D/A312-BIT

01234567

6402/

BASE ADDRESS +5 Example, 305h, 773 Decimal

D/A8D/A9D/A10D/A11D/A12D/A13D/A14D/A1516-BIT

D/A4D/A5D/A6D/A7D/A8D/A9D/A10D/A1112-BIT

01234567

6402/

D/A 1 REGISTERS

BASE ADDRESS +6 Example, 306h, 774 Decimal

D/A0D/A1D/A2D/A3D/A4D/A5D/A6D/A716-BIT

0000D/A0D/A1D/A2D/A312-BIT

01234567

6402/

BASE ADDRESS +7 Example, 307h, 775 Decimal

D/A8D/A9D/A10D/A11D/A12D/A13D/A14D/A1516-BIT

D/A4D/A5D/A6D/A7D/A8D/A9D/A10D/A1112-BIT

01234567

6402/

WRITE ONLY

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 39 40

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