SAB80515 Datasheet, PDF (78/270 Pages) Siemens Semiconductor Group – 8-Bit Single-Chip Microcontroller Family

On-Chip Peripheral Components
Table 7-7
Adjustable Internal Reference Voltages
Step
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
DAPR (.3-.0)
DAPR (.7-.4)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
V_IntAGND
0.0
0.3125
0.625
0.9375
1.25
1.5625
1.875
2.1875
2.5
2.8125
3.125
3.4375
3.75
–
–
–
V_IntAREF
5.0
–
–
–
1.25
1.5625
1.875
2.1875
2.5
2.8125
3.125
3.4375
3.75
4.0625
4.375
4.68754
The programmability of the internal reference voltages allows adjusting the internal voltage range
to the range of the external analog input voltage or it may be used to increase the resolution of the
converted analog input voltage by starting a second conversion with a compressed internal
reference voltage range close to the previously measured analog value. Figures 7-30 and 7-31
illustrate these applications.
Semiconductor Group
78