MAC7200 datasheet(868/976 Pages) FREESCALE

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Initialization/Application Information

MAC7200 Microcontroller Family Reference Manual, Rev. 2

790

Freescale Semiconductor

To keep the togetherness of command and result the result which belongs to cmd #4 is named rst #4

although it is the second conversion result in this example.

Figure 33-35 shows the described sequence:

Figure 33-35. Conversion Procedure for Example 7

33.12.3.8 Example 8: Debug Mode

This example shows a conversion sequence during Debug mode. The sequence will be frozen after a

conversion finished (“convert then freeze”) and is resumed by leaving Doze mode. In this sequence all

command words use the same setting:

•CMD #n: CWCW = “continuous conversion”

The first conversion is started as usual: there is a DMA request for a command word and therefore the

DMA writes cmd #1 to ATDCW which is pushed to ATDCC. At the end of the conversion the result is

pushed to ATDRR. After this the second conversion starts (cmd #2).

During the second conversion the system enters Debug mode. The second conversion will execute

normally until it finishes. As the system is in Debug mode and “convert then freeze” was set the next

command word (cmd #3) is not pushed to ATDCC. It will remain in ATDCW until Debug mode is left.

Once the system left Debug mode cmd #3 is pushed from ATDCW to ATDCC and the conversion

sequence will continue:

Figure 33-36. Conversion Procedure for Example 8 (part 1)

empty

cmd #2

cmd #1

empty

RX request

Write ATDCW

ATDCW

ATDCC

ATDRR

cmd #2

rst #1

empty

cmd #5

empty

LP-mode

empty

TX request

Read ATDRR

tREC

cmd #4

empty

rst #4

empty

cmd #2

cmd #1

empty

RX request

Write ATDCW

ATDCW

ATDCC

ATDRR

empty

Debug-mode

cmd #3

cmd #4

TX request

Read ATDRR

rst #4

cmd #2

cmd #4

cmd #3

rst #1

rst #2

rst #3

empty

cmd #5

empty

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