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 code library is in the public domain.
Partof the design will decrease in an Atmel part as we do not sacrifice lo gi c to i m pl eme nt th e. PRDS Permenantly freeze the protection register to its current value. This routine just waits for it to finish before returning PREN should only enable use of the protection register for the next access, so it should be called before every protection register access.
It is not necessary to erase memory locations before writing. It can be used without much difficulty with a 93C46, by avoiding calls to the routines that manipulate the extended features of the 93CS All memory locations before and including the value in R0 will become write protected. The erase functions provided in the 93C46 are unnecessary datashete the chips I’ve used, double check your data sheet. 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 applies datashedt both the 93C46 and 93CS Disclaimer These 93C46 Serial EEPROM devices are used in many commercial products where the data contained within the chip, though only bytes, is considered confidential and proprietary.
Writing must have been enabled using WEN. Flasher with Trailer Control Atmelswitches to frequency doubling, just like the standard flashers e. The early versions are long since gone. Of course, WEN must still be called before writing.
It can never be modified again after this operation. Xicor once had a considerable collection of example code on-line, but they appear to have removed it. The device is manufactured ng Atmel ‘s high density non-volatile memory technology. The fact that you have frozen the protection register is stored in the non-volatile memory 10 year min retention.
These devices are usually used to store user configurable parameters and device serial numbers. I might make another version of the code specifically for the plain 93C46, if anyone wants it enough to let me know. It applies to both datzsheet 93C46 and 93CS46 chips.
Both the and ER use the 93C46 serial. Use of this code library to modify the behavior of commercial products, without the expressed written authorization of the manufacturer, is also datashheet. The next access should be to this register instead of the memory. Pin Configuration Figure Their literature number is The erase functions are not implemented here.
As the pressure on engineers to make products smaller datasehet grown, semiconductor manufacturers have introduced datashee new interfaces, usually aimed at lower a product’s size and cost A simpler approach may be to set the bit addresses of these bits in the. If you do use it, I hope that you’ll give me some feedback.
Unfortunately, these chips use an 8 bit address field, whereas the 93C46 uses only 6. As mentioned above, four wires are actually required, and the 93CS46 has two additional lines that work together with a special write protection register.
Writing takes a considerable length of time milliseconds. 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. This 3-Wire interface chip actually has 6 wires. It is advisable to disable writing if no additional write operations are expected soon. See full device support list fortool by a number of major semiconductor manufacturers, including Altera, AMD, AtmelFairchild.
93C46 Microchip Technology Inc., 93C46 Datasheet
Outputslbit12 0. National Semiconductor has lots of data sheets on-line.
Valid address range for R0 is 0 to To you, the system designer, these datasheey chips offer a nifty way to store a small amount of data in non-volatile memory, using only a few of the port pins, and without raising the system’s cost much.
A few sources of further information datasheeg Atmel AVR microcontrollers are listed below: In addition, a considerable length of time milliseconds is required to perform a write operation.
Atmel ATA is off i. Previous 1 2 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. They only require a 5 volt power supply some 3V only versions exist too. This code library may not be used to “break into” the data stored within devices in commerical products.
A zero byte payload will return the current status. Usually, the 3-wire devices require an addition wire beyond the 3 for data transfer for each chip to be used. I 2 C is a trademard of Philips. Atmel Corporation makes nowarranty which is detailed in Atmel ‘s Terms and Conditions located on the Company’s web site.
The code can be adapted to work with these larger chips