MAC7200 datasheet(834/976 Pages) FREESCALE

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Memory Map and Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

756

Freescale Semiconductor

33.10.2.9 ATD Command Word Register (ATDCW)

This register contains the command word for the next conversion to be executed after the current one.

Each write access to this register will be regarded as a new command word. Therefore it is not

recommended to replace a 16-bit write access to ATDCW[31:16] with two 8-bit write accesses to

ATDCW[31:24] and ATDCW[23:16].

As long as a command word has not become the current command word it will be overwritten by additional

writes to the ATDCW register (See 33.11.5.1 Command Queue).

NOTE

Writing to this register during the Doze mode is not recommended. The

write access will change the register value but it will not be regarded as a

new command word. Therefore it will not start a new conversion after

waking up from Doze mode.

Address Base + 0x10

Access: User read/write

CWGI

CWCM

CWSL

CWNF

CWCH

Reset

000

876

321

000

Reset

000

Figure 33-10. ATD Command Word Register (ATDCW)

Table 33-15. ATDCW Field Descriptions

Field

Descriptions

CWAR

Command word adjust result. To reduce the total unadjusted error the conversion result can be adjusted using the

gain calibration constant and the offset calibration constant in the ATDCAL register.

0 Use raw conversion result

1 Adjust the conversion result

CWSC

Command word special channel selected. Selects between special channels and single-ended conversions. Special

channels are internal reference voltages.

0 Sample channel defined by CWCH

1 Sample special channels

See Table 33-18. Channel Selection Table for details about the channel selection.

CWGI

Command word generate interrupt. Defines whether the CC flag (ATDFLAG) should be set after a conversion

finishes.

0 Do not set CC flag

1 Set CC flag

28–27

CWCM

Command word conversion mode. Defines the way channels are sampled. There are four different ways, which are

summarized in table Table 33-16. A more detailed description of the four different mode is given later in this section.

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