SUMMARY DESCRIPTION. These electrically erasable programmable memo- ry (EEPROM) devices are accessed through a Se- rial Data. 93C46 are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 93C 93C46 datasheet, 93C46 pdf, 93C46 data sheet, datasheet, data sheet, pdf, Microchip, 1K V Microwire Serial EEPROM.

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This applies to both the 93C46 and 93CS Partof the design will decrease in an Atmel part as we do not sacrifice lo gi c to i m datashheet eme nt th e. They are usually specified to retain the data for 10 years and to endurewrite operations before failure.

Valid address range for R0 is 0 to Pin Configuration Figure datasheeg Writing takes a considerable length of time milliseconds. It is not necessary to erase memory locations before writing. MicroChip now has data sheets on-line for most of their products.

Atmel can also accept a number of other design formats with varying degrees of effort required for each.

Serial EEPROM (93C46 / 93CS46) Routines

Details of each macro can be found on the Atmel web site, at http: This code library is in the public domain. Flasher with Trailer Control Atmelswitches to frequency doubling, just like the standard flashers e.


To reclaim these pins, remove all the instructions that use ” pe ” and ” pre ” symbols. Early versions of this code worked with the 93C56 and 93C57, which have more memory.

They only require a 5 volt power supply some 3V only versions exist too. It’s up to you. Atmel ATA is off i.

This code library may not be used to “break into” the data stored within devices in commerical products. As data sheets are often updated on a regular basis, it is recommended that you consult the Atmel web site for the latest information.

This disables write operations. The device is manufactured ng Atmel ‘s high density non-volatile memory technology. The next access should be to this register instead of the memory.

93C46 Datasheet, PDF – Alldatasheet

All memory locations before and including the value in R0 will become write protected. The erase functions are not implemented here.

As mentioned above, four wires are actually required, and the 93CS46 has two additional lines that work together with a special write protection register. Unfortunately, these chips use an 8 bit address field, whereas the 93C46 uses only 6.

93C46 datasheet, 93C46 datasheets, manuals for 93C46 electornic semiconductor part

It is advisable to disable writing if no additional write operations are expected soon. As a practical matter, the code offered below only works with the Microwire 3 Wire interface, and is specifically intended to work with the 93C46, which is a standard part available from a variety of distributors.


As the pressure on engineers to make products smaller has grown, semiconductor manufacturers have introduced several new interfaces, usually aimed at lower a product’s size and cost Unprotected memory locations are still subject to WEN and WDSbut protected locations are unwritable unless the protection register is changed or cleared.

There is no way to undo this operation Please consult the relevant Atmel datasheet. PRDS Permenantly freeze the protection register to its current value. Two versions of the code are available, one with a little menu driven user interface via a terminal connected to the UART and the other with only the routines to include in your existing program. dstasheet

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In this state, the chip may have better resistance to accidental data loss due to problems on the power supply, noise on signal lines, etc.

A zero byte payload will return the current status.

The code is basically designed to manipulate a single 93CS46 chip, connected to six of the port pins. The early versions are long since gone.