Цитата
FT232R and FT245R have 128 bytes of internal EEPROM. There is one block of memory space available as
user area:
Size – the size of the user area depends on the length of the Manufacturer, ManufacturerId, Description
and SerialNumber strings programmed into the internal EEPROM. More memory space is freed up if the
lengths of the information strings are shortened. The Maximum length of the Manufacturer,
ManufacturerId, Description and SerialNumber strings is 48 words (1 word = 2 bytes). If all the 48 words
are used, then no user area space is available. The following formula can be used to calculate the
available free space.
Formula:
User Area Size (in bytes) = (48 – (Manufacturer string + Description string + ManufacturerId string +
SerialNumber string)) * 2
The start address of the user area will also vary depending on the size of the above strings used. It can
be calculated as follows:
Start Address = the address following the last byte of SerialNumber string.