Remote-processing RPC-52 Uživatelský manuál stáhnout pdf (Strana 34)

SERIAL EEPROM CHAPTER 13

Page 32

DESCRIPTION

The serial EEPROM is a 128 byte, non-volatile device

that stores various RP C-52 power up configurations.

These include baud rate, I/O port, display and keypad

type. 80 bytes are available to the user using the

SPROM stateme nts.

Information such as calibration constants, recipes, RS-

485 address, or other "soft" inform ation that may change

over time should be stored here.

An EEPROM is more secure than battery backed RAM

because it is more difficult to write to it. Several

microprocessor instructions must take place before a

byte is changed. RAM , on the other hand, requir es only

a momentary pulse to modify its memor y.

Each byte can be written to 100,000 times and read from

any number of times. The EEPROM could be updated

once a day for over 27 year s before this limit is

exceeded.

Do not constantly store information to the EEPROM.

That is, do not continuously write to it once a second as

part of your program. This is an electronic part you can

"wear out".

PROGRAM EXAMPLE

The following program example saves and retrieves a

byte of data from the EEPROM.

100 SPROM 0,A

110 A=SPROM(0)

1 2 ... 29 30 31 32 33 34 35 36

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