Campbell CR500 Especificaciones descargar pdf (Pagina 39)

Final

processed

values are stored

in Flash

EEPROM

for

transfer

to

printer,

solid state

Storage

Module or for

retrieval

via

telecommunication

links.

Values are stored

in

Final Storage

only by

the Output

Processing

Flash Memory

cR500

Instructions

and only

when

the Output

Flag is

set

in the user's

program.

Approximately

24,000

locations are

allocated to

Final Storage

on

power

up.

This number

is reduced

if Input or

Intermediate

Storage

is increased.

SRAM

(EEPROM)

Total 128

Kbytes

/

]

/

How

it works:

The

Operating System

is loaded

into

Flash

Memory at the

factory. System

Memory

is

used

while

the CR500

is

running

calculations,

butfering

data and

for

general

operating

tasks.

Any

time a

user loads

a

program

into

the

CR500, theprogram

is compiled

in

SRAM

and stored

in the

Active

Program

area

in Flash

Memory.

lf

the

CR500

is

powered

off

and then

on, the

Active

Program

is loaded

from Flash

and

run.

The

Active Program

is

run in SRAM to

maximize

speed.

The

program

accesses

lnput

Storage

and

lntermediate

Storage

and

stores data

into

Final Storage

for

later retrieval

by

the

user.

The

Active Program can

be copied

into

the

Stored

Programs

area. While 98

program "names"

are

available,

the

number

of

programs

stored

is limited

by

the

available

memory.

Stored

programs

can be

retrieved

to become

the

active

program.

While

programs

are

stored one

at a time,

all stored

programs

must be erased

at once.

That

is

because

the

flash memory

can onlY

be

written

to once

before

it must

be

erased

and

can only be

erased

in 16

Khvtes

hlocks.

Total

32

Kbytes

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F|GURE

7.2-1: CR500

Memory

29

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