AN413 datasheet(5/45 Pages) STMICROELECTRONICS

5 / 45 page

AN413

System reset

Doc ID 1875 Rev 2

5/45

device. Finally, the interrupt pending bits should be cleared, the context restored, and

individual masking and enabling bits restored to the appropriate values.

In practical programming terms there will normally be a single routine invoked on system

RESET which carries out the core system configurations listed under heading a) above. For

each individual peripheral there will typically be a single routine which carries out the

configuration and initialization operations listed under headings b) and c). There will also be

one or more interrupt routines associated with each peripheral, e.g. the A/D converter may

require in general two interrupt routines, one for End of Conversion, and one for out of range

operation (i.e. Analog Watchdog operation) on channels 6 and 7.

An example of a core-system configuration is given in Appendix B, and Appendices C,D,E,

and F give configuration/initialization examples, and Interrupt routines for the Timer, A/D

Convertor, SCI unit, and Timer/Watchdog respectively.

There is not enough space in a short note to discuss these programmes in detail on a line by

line basis. Instead the approach will be to list, for each device, the resources which need to

be taken into consideration when configuring, initializing, and servicing the particular device.

An example will then be given of the specific use of each such resource. With this

background, the interested user should be able to follow in detail those listings most relevant

to his particular application area.

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