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ST20C4 Arkusz danych(PDF) 7 Page - STMicroelectronics

Numer części ST20C4
Szczegółowy opis  Instruction Set Reference Manual
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
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1.5
Error signals
This section lists the errors and other exceptional conditions that can be signalled by
the instruction. This only indicates the error signal, not the action that will be taken by
the processor - this will depend on the trap enable bits which are set, the value in the
trap handler location, etc.
The order of the error signals listed is significant in that if a par ticular error is signalled
then errors later in the list may not be signalled. The errors that may be signalled are
as follows:
IntegerError indicates a variety of general errors such as a value out of range.
IntegerOverflow indicates that an overflow occurred during an integer arithme-
tic operation.
LoadTrap indicates that an attempt has been made to load a new trap handler.
This provides a basic mechanism for a supervisor kernel to manage user proc-
esses installing trap handlers.
StoreTrap, analogous to LoadTrap, indicates that an attempt has been made to
store a trap handler so that it can be inspected. Again this allows a supervisor
kernel to manage the trap system used by user processes.
Example
As an example, the error signals listed for the
add instruction are:
Error signals:
IntegerOverflow can be signalled by +checked
So, the only error that can be caused by
add is an integer overflow during the addition
of Areg and Breg.
1.6
Comments
This section is used for listing other information about the instructions that may be of
interest. Firstly, there is an indication of the type of the instruction. These are:
“Primary instruction” — indicates one of the 13 functions which are directly
encoded in a single byte instruction.
“Secondar y instruction” — indicates an instruction which is encoded using
opr.
Then there is information concerning the scheduling of the process:
“Instruction is a descheduling point” — a process may be descheduled after
executing this instruction.
“Instruction is a timeslicing point” — a process may be timesliced after execut-
ing this instruction.
“Instruction is interruptible” — the execution of this instruction may be inter-
rupted by a high priority process.


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