SAH-C515 SIEMENS [Siemens Semiconductor Group], SAH-C515 Datasheet - Page 106

• Manufacturer Part Number: SAH-C515
• Description: 8-Bit CMOS Microcontroller
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

DAPR.3-.0 is the contents of the low-order nibble, and DAPR.7-.4 the contents of the high-order
nibble of DAPR.
If DAPR.3-.0 or DAPR.7-.4 = 0, the internal reference voltages correspond to the external reference
voltages
If
(
(with respect to
V
Table 6-6
Adjustable Internal Reference Voltages
Step
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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
V
IntAREF
V
AINPUT
AINPUT
shown in table 6-6 can be adjusted via the special function register DAPR.
is the analog input voltage). If the external reference voltages
V
>
AGND
V
IntAREF
and
V
SS
, the conversion result is FF H , if
V
and
AREF
V
, respectively.
DAPR (.3-.0)
DAPR (.7-.4)
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
CC
) are applied, then the following internal reference voltages
6-63
V
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
IntAGND
AINPUT
On-Chip Peripheral Components
< V
IntAGDN
, the conversion result is 00 H
V
AGND
V
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
= 0 V and
IntAREF
V
V
AREF
IntAGND
= +5 V
C515
and