33
5
E
2
Key™ Function (optional)
The ROCKY-P258BX provides an optional outstanding E
2
KEY™
function for system integrator. Based on the E
2
KEY™, you can
free to store the ID Code, Password or Critical Data in the 1Kbit
EEPROM. Because the EEPROM is nonvolatile memory, you
don’t have to worry for losing very important data.
Basically the E
2
KEY™ is based on a 1Kbit EEPROM which is
configured to 64 words(from 0 to 63). You could access (read or
write) each word at any time.
When you start to use the E
2
KEY™ you should
have the utility in
the package. The software utility will include four files as follows,
README.DOC
E2KEY.OBJ
EKEYDEMO.C
EKEYDEMO.EXE.
The E2KEY.OBJ provides two library functions for user to
integrate their application with E
2
KEY™ funct
ion. These library
(read_e2key and write_e2key)
are written and compiled in C
language. Please check the following statement, then you will
know how to implement it easily.
unsigned int read_e2key(unsigned int address)
/* This function will return the E
2
KEY™’s data at address. The
address range is from 0 to 63. Return data is one word,16 bits
*/
void write_e2key(unsigned int address,unsigned data)
Summary of Contents for ROCKY-P258BX
Page 2: ......
