Chapter 4 Register structure and format 33
A/D status register BASE+8
Read-only register BASE+8 provides information on the A/D configu-
ration and operation. Writing to this I/O port with any data value
clears the its INT bit. The other data bits do not change.
BASE+8 A/D status
Bit
D7
D6
D5
D4
D3
D2
D1
D0
Value
EOC
N/A
MUX
INT
CN3
CN2
CN1
CN0
EOC
End of Conversion.
0
The A/D converter 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 that the A/D
conversion is in progress.
MUX
Single-ended/differential channel indicator.
0
8 differential channels
1
16 single-ended channels
INT
Data valid.
0
No A/D conversion has been completed since the
last time the INT bit was cleared. Values in the A/D
data registers are not valid data.
1
The A/D conversion has finished, and converted data
is ready. If the INTE bit of the control register
(BASE +9) is set, an interrupt signal will be sent to
the PC bus through interrupt level IRQn, where n is
specified by bits I2, I1 and I0 of the control register.
Though the A/D status register is read-only, writing
to it with any value will clear the INT bit.
CN3 to CN0
When EOC = 0 these status bits contain the channel
number of the next channel to be converted.
Содержание PCL-818L
Страница 1: ...PCL 818L High performance DAS card with programmable gain ...
Страница 5: ...Chapter 1 General information 1 1 General information C H A P T E R ...
Страница 13: ...Chapter 2 Installation 9 C H A P T E R 2 Installation ...
Страница 25: ...Chapter 3 Signal connections 21 3 Signal connections C H A P T E R ...
Страница 31: ...Chapter 4 Register structure and format 27 4 Register structure and format C H A P T E R ...
Страница 41: ...Chapter 5 A D conversion 37 C H A P T E R 5 A D conversion ...
Страница 47: ...Chapter 6 D A conversion 43 6 D A conversion C H A P T E R ...
Страница 50: ...46 PCL 818L User s Manual ...
Страница 51: ...Chapter 7 Digital input and output 47 7 Digital input and output C H A P T E R ...
Страница 53: ...Chapter 8 Programmable counter timer 49 8 Programmable timer counter C H A P T E R ...
Страница 61: ...Chapter 9 Direct memory access operation 57 9 Direct memory access operation C H A P T E R ...
Страница 64: ...60 PCL 818L User s Manual ...
Страница 65: ......
Страница 66: ...Appendix B Connector Switch and VR Locations 63 B Connector switch and VR Locations A P P E N D I X ...
Страница 68: ...Appendix C PC I O port address map 65 C PC I O port address map A P P E N D I X ...
Страница 70: ...Appendix D Calibration 67 D Calibration A P P E N D I X ...
Страница 73: ...70 PCL 818L User s Manual ...
Страница 75: ...2 PCL 818L User s Manual ...