500-003111-000
4-6
ANALOG INPUT MODE
HEX
MODE A2 H
MODE A1 H
MODE A0 H
ZEROED INPUTS
P2 DIFFERENTIAL
P2 SINGLE-ENDED
POSITIVE REFERENCE
NEGATIVE REFERENCE
ANALOG OUTPUT CHAN 00
ANALOG OUTPUT CHAN 01
RESERVED (ZERO)
0
1
2
3
4
5
6
7
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Table 4.4-1. Analog Input Control Modes
M3111/T4.4-1
INPUT MODE ADDRESS (CSR CONTROL BITS)
4.5
ACCESSING THE ANALOG INPUT CHANNELS
Selection of each analog input channel requires program control of the
following VMIVME-3111 Board parameters:
a. Analog Input Mode
b.
Channel
Gain
c. Channel and Input Connector (P2, P3) Selection
The analog input mode is discussed in Section 4.4. Definition of the
remaining channel selection board parameters is described in this section.
4.5.1 Gain
Selection
Analog-to-Digital Converter (ADC) gain is program-selectable as x1, x10,
x100, or x500. The two least significant control bits (D1 and D0) of the Gain
Selection Register at board-relative address 0E (HEX) control the gain as:
ADC
PGA REGISTER
GAIN
D1
D1
11
x1
0
0
x10
0
1
x100
1
0
x500
1
1
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