ST20-C1 datasheet(188/205 Pages) STMICROELECTRONICS

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Clear

A bit is clear if it has the value 0.

Creg

The 32-bit register at the bottom of the

evaluation stack.

Current process

The process being either being executed by the CPU, interrupted or trapped.

DCU

Diagnostic Controller Unit.

Descriptor

Identifier of a

process or exception.

Deschedule

process is descheduled when it is not being executed by the CPU and has not

been

interrupted or trapped by an exception handler but it is capable of being

restarted. To deschedule a process is to make it descheduled.

Diagnostic Controller Unit

ST20 hardware macro-cell which provides fully non-intrusive breakpoints, watch-

points and code tracing.

DMA

Direct memory access. A

peripheral or external device performs DMA when it

reads directly from or writes directly to memory.

DMA peripheral

peripheral with a DMA engine.

Double word

A 64-bit value, occupying two words.

Evaluation stack

The Areg, Breg and Creg, which together behave as a stack. The evaluation

stack is used for expression evaluation and to hold operands for instructions. The

registers cannot be individually addressed, but values can be pushed onto the

stack or popped off it.

Exception

A mechanism for handling events outside the normal program flow. An exception

may be an

interrupt or a trap.

Exception handler

The code and data which defines the action when an

exception is taken. An

exception handler may be a

trap handler or an interrupt handler.

Exception level

The signed integer specifying which

exception will be taken, which is the word

offset from the base of the

exception vector table to the descriptor of the process

exception.

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