Software Trigger Register. HP (Hewlett-Packard) NuDAQ PCI-9111HR, PCI-9111DG/HR

ASCAN: Auto Scan Control

0: Auto Scan OFF

1: Auto Scan ON

Only the modes listed below can be applied on the PCI-9111 card:

Bit 3

PTRG

0/1

0/1

0/1

Bit 2

EITS

0

0

1

Bit 1

TPST

0

1

X

Bit 0

ASCAN

0/1

0/1

0/1

Mode Description

Software Trigger & Polling

Timer Pacer Trigger

External Trigger

Note: The bits in this register can only control the A/D trigger source and trigger method. The trigger conditions are independent from data transfer method and interrupt generation.

3.9 Software Trigger Register

To generate a trigger pulse to the PCI-9111 for A/D conversion, you just write any data to this register, and then the A/D converter will be triggered.

Address: BASE + 0Eh

Attribute: write only

Data Format:

Bit

BASE+0Eh

7

X

6

X

5

X

4

X

3

X

2

X

1

X

0

X

3.10 Interrupt Control Register

The PCI-9111 has dual interrupt systems and two interrupt sources can be generated and be checked by the software. This register is used to select the interrupt sources.

Address: BASE + 0Ch

Attribute: write only

Data Format:

Bit

BASE+0Ch

7

X

6

X

5

X

4

X

3 2

X FFEN

1

ISC1

0

ISC0

ISC0: IRQ0 signal select

0: IRQ on the ending of the AD conversion (EOC)

18 • Registers Format