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MB96300 Super Series Hardware Manual
18.2.4
Extended Configuration Register (ADECR)
The extended configuration register (ADECR) is used to enable the A/D Converter input
channels 32 and higher.
It also enables to switch the A/D converters high and low reference voltage between
AVRH + AVRL, AVRH + AVSS and AVRH2 + AVSS. Switching the reference voltages
enables adjusting the dynamic range of the A/D converter to the signal source.
■ ADC Extended Configuration Register (ADECR)
Figure 18.2-5 ADC Extended configuration register (ADECR)
7
-
-
X
: undefined value
R/W
: Readable and writable
: Initial value
6
5
4
3
2
1
0
LSEL HSEL ADSEL
-
-
-
-
-
-
-
-
R/W
R/W R/W
Initial value
X X X X X 0 0 0
B
bit0
ADSEL
AD channel select
0
select ADC channel 0 to 31
1
select ADC channel >= 32
bit1
bit2
LSEL
HSEL
Low reference voltage High reference voltage
0
0
AVRL/AVRH2
AVSS
0
1
AVSS
1
0
AVSS
1
1
bit7 to 3
-
unused
Read value is undefined
Write always '0', Read-Modify-Write is not affected.
CHAPTER 18 A/D CONVERTER
AVRH
AVRH
AVRH
AVRL/AVRH2
447
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