MAC7200 datasheet(828/976 Pages) FREESCALE

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Memory Map and Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

750

Freescale Semiconductor

NOTE

A divide ratio of 1 (prescaler = 0b00000000) can not be set. When writing

0x00 to ATDPRE the register will automatically be set to 0x01 (divide

ratio = 2).

NOTE

Executing conversions with a clock frequency above 12 MHz or below

0.5 MHz will lead to unreliable conversion results.

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.

33.10.2.4 ATD Operating Modes Register (ATDMODE)

This register provides control bits for the ATD operating modes. For details about the meaning of the

operating modes see Section 33.11.4, “Low Power / Operating Modes.

Address Base + 0x03

Access: User read/write

321

MDIS

DOZE

DEBUG

PRED

WARP

Reset

100

Figure 33-5. ATD Operating Modes Register (ATDMODE)

Table 33-10. ATDMODE Field Descriptions

Field

Description

MDIS

Module disable. Causes all ATD clocks to halt and the analog conversion circuit to shut down. This mode offers

maximum power saving. For temporarily disabling the ATD, MDIS can be used but Doze mode is recommended.

0 Module enabled

1 Module disabled

Note: Enabling and disabling of the ATD via the MDIS bit is intended to be used primarily during the startup of the

device. Care should be taken to ensure that the ATD is in an idle state, with no conversions pending, before setting

or clearing MDIS.

DOZE

Doze mode support. Causes the analog conversion circuit to shut down but leaves the registers accessible. The

mode is intended for power saving.

0 Do not support Doze mode

1 Support Doze mode

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