ST20-C1 datasheet(189/205 Pages) STMICROELECTRONICS

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Exception vector table

The table mapping

exception levels to user processes and exception descriptors.

Executing

process is executing if the CPU is currently modifying its state. Only one process

can be executing at any one time.

External interrupt

interrupt generated by a peripheral or external device, routed through the

interrupt controller and handled by an interrupt handler.

Function

A named section of code which may have parameters and may return one or more

values.

Function

A primary instruction.

Function code

The most significant 4-bits of an

instruction component, which defines the action

of the component.

Half-word

A 16-bit value or location.

Half-word aligned

An address is half-word aligned if it is divisible by two, i.e. if bit 0 is 0.

Idle

The CPU is idle when there is no

process or exception handler executing.

Inactive

A process is inactive if it is capable of being restarted but it is currently waiting for

some event to occur before it can continue. The event might be a semaphore

signal or a peripheral completing a DMA.

Instruction

A code element corresponding to a single instruction set mnemonic, consisting of

zero or more

prefixes followed by a non-prefix instruction component.

Instruction component

A single byte of code, consisting of a function code and 4 bits of data.

Instruction data value

The operand of a

primary instruction, which is built from the least significant 4 bits

of each of the

instruction components of the instruction.

Instruction pointer

The 32-bit CPU register which holds the address of the next

instruction to be

executed by the

current process.

Integer

A whole number, which may be positive, negative or zero.

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