EEWrite
EEWrite address, data, byteLength
| address | 0 to 4095 |
| data | Data to write to EEPROM (up to Long type values) |
| byteLength | Number of bytes to read (1 to 4) |
Store data in the specified address in EEPROM. This is very useful for storing configuration or calibration data.
Dim A As Integer Dim B As Integer A = 100 EEWrite 0,A,2 ' Store A in Address 0. Delay 5 ' Wait for writing. B = EERead(0,2) ' Read from Address 0 and store in B.
For an example using Single data type, see Peek( ) and Poke.
When writing to the EEPROM, it takes about 3 to 5 milliseconds. When reading from the EEPROM, it takes less than 1 millisecond. There is a physical limit of around 100,000 writes to each location within the EEPROM.
If you are using the EEPROM for data acquisition or data that requires a lot of writes, we recommend using a module with battery-backup memory, such as the CB290 or CB405, instead. One alternative is an RS-232 Compact Flash (CF) or Secure Digital (SD) memory interface module.
The following table compares SRAM and EEPROM
| Type | Battery Backup SRAM | EEPROM |
|---|---|---|
| Life of Data | Depends on battery capacity | 40 Years |
| Maximum Writes | Essentially Infinite | About 100,000 |
| Writing Time | Essentially 0ms | 3 to 5 ms |
| General use | Store often-used variable information over a power outage. Example: Daily production counter. | Important data that needs to survive even a backup battery failure. Example: Product serial number |