Rev. 3.0, 03/01, page 338 of 390
19.2.3
A/D Calibration Sample Control Register (ADCALCR)
ADCALCR is a 16-bit write-only register that enables A/D calibration sample conversion. When
the calibration sample is enabled, the A/D conversion produces 10-bit data which corresponds to
the calibration analog value (½ VDD = ½ x 3.3 Volt). The 10-bit data will be stored into ADCAL
register.
The A/D conversion software can take the advantage of the disparity between the data and the
golden value to calibrate the influence of the semiconductor process. The procedure will enhance
the accuracy of the sample conversion described below:
Bit
7
6
5
4
3
2
1
0
Bit Name
-
-
-
-
-
-
-
CAL
Initial Value
0
0
0
0
0
0
0
0
R/W
-
-
-
-
-
-
-
W
Bit
Description
Default
0
Calibration enable (CAL): Enables or disables calibration sample conversion. When set to
1, A/D conversion starts sampling the internal calibration analog value (½ VDD). The
converted 10-bit data will be stored into ADCAL register. When the conversion ends, CAL
is automatically cleared to 0.
0
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