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ST72C171 Datasheet(PDF) 46 Page - STMicroelectronics

No. de pieza ST72C171
Descripción Electrónicos  8-BIT MCU with 8K FLASH, ADC, WDG, SPI, SCI, TIMERS SPGAs Software Programmable Gain Amplifiers, OP-AMP
PDF  152 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72C171 Datasheet(HTML) 46 Page - STMicroelectronics

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OP-AMP MODULE (Cont’d)
VOLTAGE REFERENCE CONTROL REGISTER
(OAVRCR)
Read/Write
Reset value: 0000 0000 (00h)
Bit 7 = VR2E:
VR2 Enable
This bit is set and reset by software. When the ref-
ererence voltage is selected (PS2[1:0] = 00 in the
OA2CR register) it connects VSSA (analog ground)
or Reference Voltage 2 (VR2) to the OA2 positive
input.
0: OA2 positive input is connected to VSSA
1: OA2 positive input is connected to VR2 voltage
value
Bit 6:4 = VR2[2:0]
Voltage selection for channel 2
of the 8-step reference voltage
These bits are set and reset by software, they
specify the Reference Voltage 2 (VR2) connected
to the OA2 positive input when PS2[1:0] = 00 in
the OA2CR register
..
Bit 3= VR1E
VR1 Enable
This bit is set and reset by software. When the ref-
ererence voltage is selected (PS1[1:0] = 00 in the
OA1CR register) it connects VSSA (analog ground)
or Reference Voltage 1 (VR1) to the OA1 positive
input.
0: OA1 positive input is connected to VSSA
1: OA1 positive input is connected to VR1 voltage
value
Bit 2:0 - VR1[2:0]
Voltage selection for channel 1
of the 8-step reference voltage
These bits are set and reset by software, they
specify the Reference Voltage 1 (VR1) connected
to the OA1 positive input when PS1[1:0] = 00 in
the OA1CR register
.
Note: When both VR2E and VR1E are reset, the
8-step voltage reference cell is disabled and en-
ters low power mode.
70
VR2E
VR22
VR21
VR20
VR1E
VR12
VR11
VR10
Reference
Voltage 2
VR2E
VR22
VR21
VR20
0 (VSSA)0
x
x
x
VDDA/8
100
0
2 x VDDA/8
100
1
3 x VDDA/8
101
0
4 x VDDA/8
101
1
5 x VDDA/8
110
0
6 x VDDA/8
110
1
7 x VDDA/8
111
0
VDDA
111
1
Reference
Voltage 1
VR1E
VR12
VR11
VR10
0 (VSSA)
0
xxx
VDDA/8
10
00
2 x VDDA/8
10
01
3 x VDDA/8
10
10
4 x VDDA/8
10
11
5 x VDDA/8
11
00
6 x VDDA/8
11
01
7 x VDDA/8
1
1
1
VDDA
11
1



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