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DATA LOGGING PROGRAM FOR TESTING ST7 APPLICATIONS VIA ICC

Figure 2. PC software flowchart

After entering ICC mode, the PC software modifies the ST7 stack so that the position corre-

sponding to the Program Counter contains the address of the user application. Hence, the ex-

ecution of the Go command has the effect of jumping to the user application and executing it.

The external controller software then loops to receive bytes till the keyboard is hit. The bytes

received are stored in the file “Datafile.doc” in the PC_application folder.

INITIALIZE PARALLEL PORT

GET USER OPTION BYTE

STOP

OVERWRITE PC AT BOTTOM

APPLICATION START ADDRESS

EXECUTE ICC GO COMMAND

RECEIVE A BYTE OF DATA

FROM ST7 AND STORE IN FILE

USER

HIT ANY

KEY?

MODE SELECTION

OF ST7 STACK WITH

No

Yes