Remote-processing RPC-2350 Manual do Utilizador descarregar pdf (Página 16)

CHAPTER 3 SAVING AND LINKING PROGRAMS

3-1

Figure 3-1 Flash location and jumpers

CHAPTER SYNOPSIS

 Saving programs to Flash

 Retrieving programs from F lash

 Load and run two programs

 Autorun on reset or power up

 Installing 128K or 512K Flash

DESCRIPTION

SAVING AND LINKING PROGRAMS CHAPTER 3

Two to 8 programs can be stored in socket U3. U3

normally has a 29C010A Flash type EPROM, which

stores 2 progr ams. Its capacity is 128K bytes.

U3 socket can accept a 29C0 40A type E PROM. This

type has 512K byte capacity and can store up to 8

program s.

You can store two to eight programs up to a maximum

size of about 33K bytes each. A general rule to

determine program storage requirem ents is one line

requires 40 bytes. 32K bytes would store over 800 lines

of code. Your application could be significantly more or

less, depending upon the number of commands / line,

comments, and print statements. Another indication of

program size is to use the file length as saved on a PC

disk.

The 29C 010A (128K) Flash can store 2 progr ams while

the 29C040A (512K) stores up to 8 programs.

Despite the fact you have 128K or 512K RAM installed,

the maxim um program size CA MBASIC can run is

about 33K (leaving room for variable storage).

Programs can be chained, however. When programs are

chained, variables from one prog ram can be used in

another.

Data can be saved to and retrieved from this device

using the SAVE and LOA D comm ands. The m aximum

amount of data that can be accessed is limited by the size

of your program less the Flash size.

The Flash EPROM is non-volatile (retaining data even

when power is disconnected), having an unlimited

number of re ad cycles and a limited number of write

cycles (about 1,000 to 10,000). U sing 1,000 c ycles as a

limit, you can write to Flash once a da y for abo ut 3

years before “wearing out” the device.

A program is not run fr om EPROM. It is transfer red to

RAM and run from there. Pr ograms in RAM are run

and can be modified. They can be saved to EPROM for

execution later.

The RPC -2350 is set to autorun on power up or reset by

installing a jumper (W11). When autorun is on, the

program in E PRO M is loaded into RAM and begins to

execute immediately.

The EP ROM is write-protected w ith a software lock, so

accidental writes on pow er-on or -off are almost

impossible. You cannot disable the lock except when

executing the SAVE command.

SAVING A PROGRAM

To save a program , set jumper W 11. You m ay set the

jumper even if the power is on. Remember to discharge

any static electricity before installing or removing the

jumper. For this example, assume you wanted to save

the following program:

10 FOR N = 0 TO 2

20 PRINT "Hello ";

30 NEXT

40 PRINT

If this progr am is not alr eady in, type it in now (or, if

you prefer, use your own program).

You can save your program to any one of two locations:

0 or 1. Prog ram s saved to location 0 will automatically

run at power up. Syntaxes to save a program are:

SAVE

SAVE program

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 82 83

Comentários a estes Manuais

Sem comentários

Remote-processing RPC-2350 Manual do Utilizador Página 16

Comentários a estes Manuais

Manuais e produtos relacionados com Computadores Remote-processing RPC-2350