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ST20-GP6 Datasheet(PDF) 29 Page - STMicroelectronics

No. de pieza ST20-GP6
Descripción Electrónicos  GPS PROCESSOR
PDF  123 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20-GP6 Datasheet(HTML) 29 Page - STMicroelectronics

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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.
1
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.
2
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.
3
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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