MAC7200 datasheet(831/976 Pages) FREESCALE

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Memory Map and Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

753

time is used to detect a broken sensor connection. For further details about the predischarge feature please

see Section 33.11.7, “Conversions Using Predischarge”.

33.10.2.7 ATD Interrupt Register (ATDINT)

This register contains the interrupt enable bits corresponding to the flags in the ATDFLAG register. If a

flag is set and the interrupt enable bit for this flag is also set, an interrupt will be asserted to the system

interrupt controller.

Address Base + 0x08

Access: User read/write

321

TIME

Reset

000

Figure 33-7. ATD Predischarge Time Select Register (ATDPTS)

Table 33-12. ATDPTS Field Descriptions

Field

Description

7–4

Reserved, should be cleared.

3–0

TIME

Defines the time during which the sample capacitor will be discharged. During this time also the parasitic capacities

of the current ATD channel will be discharged. The time can be selected between 2 ATD clock cycles and 16 ATD

clock cycles (TIME = 0x01..0x0F). TIME = 0x00 also means 2 ATD clock cycles discharge time.

The ATD channel which will also be predischarged is defined by the CWCH bits of the current command word. The

following scenarios are possible:

• When the current command word selects any channel and the feature ‘special channel’ is not set then the channel

selected by the CWCH bits will be discharged.

• When the current command word selects one of the ATD reference voltage channels only the sample capacitor is

discharged.

The predischarge feature can be enabled via the ATDMODE.PRED bit. Please see Section 33.10.2.4, “ATD

Operating Modes Register (ATDMODE)”. If the feature is disabled the bit values in this register are ignored. For

further details about the Predischarge feature please refer to Section 33.11.7, “Conversions Using Predischarge”.

Address Base + 0x0E

Access: User read/write

321

CQNFIE

CQFIE

CQEIE

CRLIE

ETOIE

CPIE

CCIE

Reset

010

000

Figure 33-8. ATD Interrupt Register (ATDINT)

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