User`s guide

12 • Registers Format
Channel No. CH4 CH3 CH2 CH1 CH0
0 0 0 0 0 0
1 0 0 0 0 1
2 0 0 0 1 0
3 0 0 0 1 1
:
30 1 1 1 1 0
31 1 1 1 1 1
Table 3.2 Channel Multiplexering
3.4 A/D Range Control Register
The A/D range register is used to adjust the analog input ranges for A/D
channels. Two factor will effect the input range: Gain and Bipolar/Unipolar.
Both of these issues can be controlled by this register. The Table 4.2 shows
the relationship between the register data and the A/D input range.
Address: BASE + 9
Attribute: write only
Data Format:
Bit 7 6 5 4 3 2 1 0
X X X X X G2 G1 G0
The relationship between input voltage range, maximum input voltage and
gain is specified as the equation:
Analog Input Range = Maximum Input Voltage / Gain