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MSC1212Y2 Datasheet, PDF (60/69 Pages) Burr-Brown (TI) – Precision Analog-to-Digital Converter (ADC)
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CAL2-0
bits 2-0
Calibration Mode Control Bits.
CAL2
0
0
0
0
1
1
1
1
CAL1
0
0
1
1
0
0
1
1
CAL0
0
1
0
1
0
1
0
1
CALIBRATION MODE
No Calibration (default)
Self Calibration, Offset and Gain
Self Calibration, Offset Only
Self Calibration, Gain Only
System Calibration, Offset Only
System Calibration, Gain Only
Reserved
Reserved
Read Value—000B.
ADC Control Register 2 (ADCON2)
SFR DEH
7
DR7
6
DR6
5
DR5
4
DR4
3
DR3
2
DR2
DR7-0
bits 7-0
Decimation Ratio LSB.
1
DR1
0
DR0
Reset Value
1BH
ADC Control Register 3 (ADCON3)
7
6
SFR DFH
—
—
5
4
3
2
1
0
Reset Value
—
—
—
DR10
DR9
DR8
06H
DR10-8
bits 2-0
Decimation Ratio Most Significant 3 Bits. The output data rate = (ACLK + 1)/ 64/Decimation Ratio.
Accumulator (A or ACC)
SFR E0H
7
ACC.7
6
ACC.6
5
ACC.5
4
ACC.4
3
ACC.3
2
ACC.2
1
ACC.1
0
ACC.0
ACC.7-0
bits 7-0
Accumulator. This register serves as the accumulator for arithmetic and logic operations.
Reset Value
00H
Summation/Shifter Control (SSCON)
7
6
5
4
3
2
1
0
Reset Value
SFR E1H
SSCON1 SSCON0
SCNT2
SCNT1
SCNT0
SHF2
SHF1
SHF0
00H
The Summation register is powered down when the ADC is powered down. If all zeroes are written to this register the 32-bit
SUMR3-0 registers will be cleared. The Summation registers will do sign extend if Bipolar is selected in ADCON1.
SSCON1-0 Summation/Shift Control.
bits 7-6
SSCON1 SSCON0 SCNT2 SCNT1 SCNT0
SHF2
SHF1
SHF0 DESCRIPTION
0
0
0
0
0
0
0
0
Clear Summation Register
0
0
0
1
0
0
0
0
CPU Summation on Write to SUMR0
0
0
1
0
0
0
0
0
CPU Subtraction on Write to SUMR0
1
0
x
x
x
Note (1) Note (1) Note (1) CPU Shift Only
0
1
Note (1) Note (1) Note (1)
x
x
x
ADC Summation Only
1
1
Note (1) Note (1) Note (1) Note (1) Note (1) Note (1) ADC Summation Completes then Shift Completes
NOTES: (1) Refer to register bit definition.
SCNT2-0
bits 5-3
Summation Count. When the summation is complete an interrupt will be generated unless masked. Reading the
SUMR0 register clears the interrupt.
SCNT2 SCNT1 SCNT0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
SUMMATION COUNT
2
4
8
16
32
64
128
256
60
MSC1212
www.ti.com
SBAS278A
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