ST20-C1 datasheet(192/205 Pages) STMICROELECTRONICS

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Pointer

address.

Prefix

instruction component used to extend the data value of the following instruction

component. There are two prefixes -

pfix (function code #2) which preserves the

sign and

nfix (function code #6) which complements the data value and so

changes the sign.

Primary instruction

One of thirteen directly coded instructions which therefore do not require an

operate instruction component. A primary instruction has a data part associated

with it, called the operand.

cf. secondary instruction.

Priority

A value associated with each process or interrupt which is used to make choices

when conflicts occur .

Procedure

A named section of code which may have parameters.

Process

A sequential algorithm and data which can run in parallel with other

processes.Processes are also known as tasks or threads. Each process is identi-

fied b y a task descriptor which points to a process descriptor block.

Process descriptor block

A data structure defining a

process, including the saved instruction pointer,

workspace pointer and a link used for queueing processes.

Process pointer

A pointer to a

process.

Queue

A linked list.

Real time operating system

operating system providing facilities for real-time programming, including multi-

tasking and interrupt handling.

Registers used to

cache the lowest words of the work space in order to accelerate

access to local variables. Also called

work space cache or register file.

See

RTOS

Real-time operating system.

Scheduler

Code or hardware which controls how processes share CPU time.

ST20-C1 Datasheet(PDF) 192 Page - STMicroelectronics

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