MAC7200 datasheet(830/976 Pages) FREESCALE

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Memory Map and Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

752

Freescale Semiconductor

NOTE

Write accesses to this register are not recommended while a conversion is

running as the conversion result might get corrupted.

33.10.2.6 ATD Predischarge Time Select Register (ATDPTS)

This register defines the duration of the predischarge phase. During the predischarge phase the sample

capacitor and the parasitric capacitiy of the current analog channel will be discharged. The predischarge

Table 33-11. ATDCAL Field Descriptions

Field

Descriptions

Reserved, should be cleared.

30–16

GCC

Gain Calibration Constant. This register contains the Gain Calibration Constant used to adjust the ATD conversion

results. The constant is calculated from the Gain value:

• GCC = Gain x 16384.

The GCC range is 0 <= 32767 corresponding to the Gain range 0 <= gain < 2.

Example: Gain is assumed to be 1.024. In this case GCC = 1.024 x 16384 = 16777.2. The value for GCC must be

truncated to 16777. In binary format, this is 0b100_0001_1000_1001.

15–14

Reserved, should be cleared.

13–0

OCC

Offset Calibration Constant. This register contains the Offset Calibration Constant used to adjust conversion results.

It is calculated from the Offset value:

• Offset >= 0: OCC = Offset x 4

• Offset < 0: OCC = Offset x 4 + 16384

The OCC range is 0 <= OCC <= 8191 corresponding to Offset range -2048 <= Offset <= 2047.75 in steps of 0.25.

Example (positive Offset): Offset is assumed to be 3.8. In this case OCC = 3.8 x 4 = 15.2. The value for OCC must

be truncated to 15. In binary format, this is 0b00_0000_0000_1111.

Example (negative Offset): Offset is assumed to be -3.8. In this case OCC = -3.8 x 4 + 16384 =

-15.2 +16384 = 16368.8. The value for OCC must be truncated to 16368. In binary format, this is

0b11_1111_1111_0000.

The following table gives some examples for OCC values vs. Offset value:

OCC[13:0]

Offset (decimal)

0b00_0000_0000_0000

0b00_0000_0000_0001

0.25

0b00_0000_0000_0010

0.5

0b01_1111_1111_1111

2047.75

0b10_0000_0000_0000

-2048

0b10_0000_0000_0001

-2047.75

0b11_1111_1111_1111

-0.25

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