ST20-GP6 datasheet(29/123 Pages) STMICROELECTRONICS

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ST20-GP6 Datasheet(PDF) 29 Page - STMicroelectronics

Part #	ST20-GP6

Description	GPS PROCESSOR

PDF	123 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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29 / 123 page

ST20-GP6

29/123

4.6.5 Restrictions on trap handlers

There are various restrictions that must be placed on trap handlers to ensure that they work cor-

rectly.

Trap handlers must not deschedule or timeslice. Trap handlers alter the

Enables masks,

therefore they must not allow other processes to execute until they have completed.

Trap handlers must have their

Enable masks set to mask all traps in their trap group to

avoid the possibility of a trap handler trapping to itself.

Trap handlers must terminate via the

tret (trap return) instruction. The only exception to this

is that a scheduler kernel may use

restart to return to a previously shadowed process.

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