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 Chapter 8. Advanced Experiments 8.5. Experiment with 93C46 Serial EEPROM The 93C46 provides 1024 bits of serial electrically-erasable programmable read-only memory (EEPROM) organized as 64 words of 16 bits each. The device is opti-mized for use in many industrial and commercial applications where low-power and low-voltage operation are essential. The 93C46 is available in space-saving 8-lead PDIP, 8-lead JEDEC SOIC, and 8-lead TSSOP packages. The 93C46 is enabled through the Chip Select pin (CS) and accessed via a three-wire serial interface consisting of Data Input (DI), Data Output (DO), and Shift Clock (SK). Upon receiving a Read instruction at DI, the address is decoded and the data is clocked out serially on the data output DO pin. The write cycle is completely self-timed and no separate erase cycle is required before write. The write cycle is only enabled when the part is in the erase/write enable state. When CS is brought high following the initiation of a write cycle, the DO pin outputs the ready/busy status of the part.
CS: Chip Select SK: Serial Data Clock DI: Serial Data Input DO: Serial Data Output GND: Ground VCC: Power Supply NC: No Connect Instruction Set for the AT93C46E:
Program FunctionThe experiment illustrates the I2C communication between MCU and 24C01 EEPROM. Data 0x55 and 0xAA are written to EEPROM at memory address 0x02 and 0x03. The data read from EEPROM will be displayed on LED display. By default, the address to be read is 0x02, user can change the address. Toggle on the function select to ‘93C**’ before this experiment.
Schematic Diagram
Program Flow Chart
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