ADUC847BCP8-5 AD [Analog Devices], ADUC847BCP8-5 Datasheet - Page 45

• Manufacturer Part Number: ADUC847BCP8-5
• Description: MicroConverter Multichannel 24-/16-Bit ADCs with Embedded 62 kB Flash and Single-Cycle MCU
• Manufacturer: AD [Analog Devices]

ADC1CON (AUXILIARY ADC CONTROL REGISTER) (ADuC845 ONLY)
ADC1CON is used to configure the auxiliary ADC for reference, channel selection, and unipolar or bipolar coding. The auxiliary ADC is
available only on the ADuC845.
SFR Address:
Power-On Default:
Bit Addressable:
Table 27. ADC1CON SFR Bit Designations
Bit No.
7
6
5
4
3, 2, 1, 0
1
Note the following about the temperature sensor:
– When the temperature sensor is selected, user code must select the internal reference via the AXREF bit and clear the AUNI bit (ADC1CON.5) to select bipolar coding.
– Chop mode must be enabled for correct temperature sensor operation.
– The temperature sensor is factory calibrated to yield conversion results 800000H at 0°C (ADC chop on).
– A +1°C change in temperature results in a +1 LSB change in the ADC1H register ADC conversion result.
– The temperature sensor is not available on the ADuC847 or ADuC848.
Name
–––
AXREF
AUNI
–––
ACH3, ACH2, ACH1, ACH0
D3H
00H
No
Description
Not Implemented. Write Don’t Care.
Auxiliary (ADuC845 only) ADC External Reference Bit.
Set by the user to enable the auxiliary ADC to use the external reference via REFIN±.
Cleared by the user to enable the auxiliary ADC to use the internal band gap reference.
Auxiliary ADC cannot use the REFIN2± reference inputs.
Auxiliary (ADuC845 only) ADC Unipolar Bit.
Set by the user to enable unipolar coding, that is, zero input results in 000000H output.
Cleared by the user to enable bipolar coding, zero input results in 800000H output.
Not Implemented. Write Don’t Care.
Auxiliary ADC Channel Select Bits. Written by the user to select the auxiliary ADC channel.
ACH3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
ACH2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Rev. A | Page 45 of 108
ACH1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
ACH0 Selected Auxiliary ADC Input Range (V
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
AINCOM–AINCOM
AIN1–AINCOM
AIN2–AINCOM
AIN4–AINCOM
AIN5–AINCOM
AIN6–AINCOM
AIN7–AINCOM
AIN8–AINCOM
AIN1–AIN2
AIN3–AIN4
AIN5–AIN6
AIN7–AIN8
Temperature Sensor
AIN3–AINCOM
AIN9–AINCOM (not a valid selection on the MQFP package)
AIN10–AINCOM (not a valid selection on the MQFP package)
ADuC845/ADuC847/ADuC848
1
REF
= 2.5 V).