MAC7200 datasheet(829/976 Pages) FREESCALE

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Memory Map and Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

751

NOTE

Writing to this register will stop the current conversion and discard the

command word in ATDCW. A DMA-request for fetching a command word

will be asserted. The DMA-request for saving a result will remain as it is. A

new conversion will start after a command word has been written to the

command register.

33.10.2.5 ATD Calibration Register (ATDCAL)

This register contains the calibration constants used to adjust the ATD conversion results to reduce the total

unadjusted error. Section 33.12.2, “ATD Calibration / Result Adjustment,” for details about the calibration

scheme.

5–4

DEBUG

Debug mode support. Allows the user to enable Debug features. This is useful for debugging real-time systems,

where continuation of the conversion process after the MCU has been halted could result in abnormal system

behavior. The ATD can react in different ways when Debug mode is entered:

00 Continue conversion (Debug mode disabled for the ATD).

01 Reserved for future use.

10 Finish current conversion, then freeze.

11 Freeze immediately.

PRED

Pre-discharge. This bit allows to pre-discharge the sample capacitor before the actual conversion starts. The voltage

after pre-discharging is VRL. Enabling this feature will require a higher conversion time. Section 33.11.6, “Conversion

Timing and See 33.11.7 Conversions Using Predischarge for details.

0 Pre-discharge to VRL is disabled

1 Pre-discharge to VRL is enabled

WARP

Warp transfer curve. This bit allows to slightly warp the ATD transfer curve. This will change the raw result value of

the conversions. This bit can be used to increase the ATD accuracy (See 33.12.2 ATD Calibration / Result

Adjustment for details).

0 Warp disabled

1 Warp enabled

1–0

Reserved, should be cleared.

Address Base + 0x4

Access: User read/write

GCC

Reset

010

000

876

321

OCC

Reset

000

Figure 33-6. 32ATD Calibration Register (ATDCAL)

Table 33-10. ATDMODE Field Descriptions (Continued)

Field

Description

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