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AD1200 Reference
the A/D converter. For Single Ended or Pseudo Differential
operation all 4 bits are used to select one of the 16 possible
channels. For Differential operation only bits 0, 1 & 2 effect the
channel selection, bit 3 is a "don't care" bit.
Set By:
These bits are set under program control.
Reset By: They are cleared under program control.
These bits are automatically cleared at power up.
ADGCR A/D Channel Selection.
Channel Select
3
2
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
The A/D Converter Input Registers. Read Only
________________________________________ _
The A/D Converter returns a 12 bit value that is the digital
representation of the selected analogue input signal. This 12 bit
value is read as from two adjacent 8 bit, read only, registers.
The ADCLO register contains the lower 8 bits of the 12 bit
value. The ADCHI register contains the upper 4 bits of the 12
bit value. The upper most 4 bits from the ADCHI register
always read back as 0.
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Figure 3-8. Channel Selection.
1
0
Hex Single Ended Differential
0
0
00
0
1
01
1
0
02
1
1
03
0
0
04
0
1
05
1
0
06
1
1
07
0
0
08
0
1
09
1
0
0A
1
1
0B
0
0
0C
0
1
0D
1
0
0E
1
1
0F
Channel Selected
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Register Map
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
Chapter 3
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