PICkit? 3 User’s Guide
Initialized Data
Data which is defined with an initial value. In C,
int myVar=5;
defines a variable which will reside in an initialized data section.
Instruction Set
The collection of machine language instructions that a particular processor
understands.
Instructions
A sequence of bits that tells a central processing unit to perform a particular operation
and can contain data to be used in the operation.
Internal Linkage
A function or variable has internal linkage if it can not be accessed from outside the
module in which it is defined.
International Organization for Standardization
An organization that sets standards in many businesses and technologies, including
computing and communications.
Interrupt
A signal to the CPU that suspends the execution of a running application and transfers
control to an Interrupt Service Routine (ISR) so that the event may be processed. Upon
completion of the ISR, normal execution of the application resumes.
Interrupt Handler
A routine that processes special code when an interrupt occurs.
Interrupt Request
An event which causes the processor to temporarily suspend normal instruction exe-
cution and to start executing an interrupt handler routine. Some processors have
several interrupt request events allowing different priority interrupts.
Interrupt Service Routine
A function that handles an interrupt.
Interrupt Service Routine
User-generated code that is entered when an interrupt occurs. The location of the code
in program memory will usually depend on the type of interrupt that has occurred.
Interrupt Vector
Address of an interrupt service routine or interrupt handler.
IRQ
See Interrupt Request.
ISO
See International Organization for Standardization.
ISR
See Interrupt Service Routine.
L-value
An expression that refers to an object that can be examined and/or modified. An l-value
expression is used on the left-hand side of an assignment.
Latency
The time between an event and its response.
DS51795A-page 78
? 2009 Microchip Technology Inc.
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