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Old 01-17-2011, 12:14 AM
nDever nDever is offline
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Default Parallax Propeller 32K EEPROM Substitute

Hey Guys,

I am preparing to use a Parallax Propeller Microcontroller. The MCU's program can either be inputted into the chip directly via USB or read into the chip by way of external 32K Serial EEPROM. I would like to use the external memory option, however, I would like to be able to substitute the EEPROM if I can with a 28C256 Paged EEPROM because it is readily available. I would have to make a few modifications to the circuit because the MCU communicates to external memory serially (Address/Data I/O, Clock). Can you guys offer me any options available to connect a serial MCU with a parallel memory chip?

I believe that I can communicate with memory if I connect its data output pins to a PISO shift register and connect the register's clock to the MCU's clock and have the data shifted out of the register every pulse.
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Old 01-17-2011, 12:19 AM
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blueroomelectronics blueroomelectronics is offline
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Even the most simple circuit would cost more than a commonly available 256kb serial EEPROM. What part of the world can get a Parallax Propeller but not a 24LC256?
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Old 01-17-2011, 12:35 AM
nDever nDever is offline
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The schematic calls for 256K but Jameco does not have the 24LC256 at the moment. Will I be able to use a 24C512? I assume this means that the circuit will still work but I will have more space than necessary?
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Old 01-17-2011, 12:37 AM
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The 512 might work, try the Parallax forums for an accurate answer.
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