Advantech PCL-818 Series Manual de usuario descargar pdf (Pagina 63)

55 Appendix C

C.11 Clear Interrupt Request — BASE+08H

Write any value to register BASE+08H to clear the interrupt request.

Table C-11 Register for Clear Interrupt Request

C.12 A/D Status — BASE+08H

Read-only register BASE+08H provides information on the A/D configu-

ration and operation. Including:

• Bipolar or unipolar input for the channel to be converted next

• Single-ended or differential input

• Interrupt status for the channel already converted

• End of conversion for the channel already converted

• Channel to be converted next

Writing to this I/O port with any data value clears its INT bit. The other

data bits do not change.

Table C-12 Register for A/D Status

EOC End of Conversion

0 The A/D conversion is idle, ready for the next conversion. Data

from the previous conversion is available in the A/D data registers.

1 The A/D converter is busy, implying conversion is in progress.

U/B Unipolar/bipolar mode indicator

0 Bipolar mode

Unipolar mode

Write A/D control

Bit # 76543210

BASE + 09H X X X X X X X X

Read A/D status

Bit # 7 6 5 4 3 2 1 0

BASE + 08H EOC U/B MUX INT CN3 CN2 CN1 CN0

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 73 74

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Advantech PCL-818 Series Manual de usuario Pagina 63