ST20-C1 datasheet(187/205 Pages) STMICROELECTRONICS

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Glossary

Active process

An active

process in a multi-tasking program is one that is either executing or

waiting for CPU time. It may have been

interrupted or trapped or it may be waiting

on a

scheduling queue.

Address

A 32-bit integer used to identify one byte of memory or memory-mapped device.

ST20 addresses are signed, i.e. the address range is the same as the range of a

signed 32-bit integer. A

pointer.

Address space

The range of valid addresses.

Areg

The 32-bit register at the top of the

evaluation stack.

Arithmetic shift

A shift in which the sign bit is preserved. An arithmetic right shift copies the sign bit

into the vacated bits.

Array

A data structure in which all the elements are of the same type and are identified

by a non-negative integer subscript. A

vector.

Bit

A binary digit, which can take the value 1 (also called

set or true) or 0 (also called

clear or false).

Bitwise operation

An operation on multi-bit values which treats each bit as a true (if

set) or false (if

clear).

Boolean

Logic values and calculations using AND, OR, and NOT. A multi-bit value is treated

as Boolean if it represents a single true of false value, as opposed to

bitwise.

Breg

The 32-bit register in the middle of the

evaluation stack.

Byte

An 8-bit value or location.

Cache

Fast memory used to temporarily hold copies of slow memory locations in order to

provide high performance memory access with slow memory.

Channel

A synchronous, one-way, point-to-point, unbuffered communications mechanism.

ST20-C1 데이터시트(PDF) 187 Page - STMicroelectronics

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