| ??? 09/19/08 20:13 Modified: 09/19/08 20:15 Read: times |
#158416 - serial EEPROM Responding to: ???'s previous message |
Suneet Srivastava said:
i have a AT89c52
does the processor write to the flash memory? No, there is no way you can write to it's own FLASH program memory on this microcontroller. There are '51 derivatives where you can do that, but those are the more expensive ones, e.g. the 'RD2 family (for example AT89C51RD2). Suneet Srivastava said:
i can't afford to change the chip as all the connections have been soldered according to that IC . any way around the problem ? 3 out of 4 ports have already been used . so that doesn't leave many options for EEPROM interfacing You need only 2 IO ports to add an I2C EEPROM memory, such as the 24Cxx (e.g. 24C02 - they come in dansities ranging from 128 bytes to 64 k bytes, and the suffix depends on this). There is a lot of example code around in the net, see for example Atmel's website - there's an appnote on interfacing these memories to the '51 there. JW |
| Topic | Author | Date |
| are values stored in memory permanent ? | 01/01/70 00:00 | |
| Depends on memory | 01/01/70 00:00 | |
| I A P | 01/01/70 00:00 | |
| could you help me with the IC | 01/01/70 00:00 | |
| serial EEPROM | 01/01/70 00:00 | |
| serial EEPROM with SPI also possible | 01/01/70 00:00 | |
| I have my doubts... | 01/01/70 00:00 | |
| I2C takes some reading to implement | 01/01/70 00:00 | |
| that's the point | 01/01/70 00:00 | |
| Values in the Memory | 01/01/70 00:00 | |
| a caveat | 01/01/70 00:00 | |
| RE: a caveat | 01/01/70 00:00 | |
| Any assemblers? | 01/01/70 00:00 | |
| As long as others are all being strictly technical | 01/01/70 00:00 | |
C standard | 01/01/70 00:00 | |
| Another caveat | 01/01/70 00:00 | |
| sorry for the delay | 01/01/70 00:00 | |
| which? | 01/01/70 00:00 | |
| Maxim too has One-wire EEPROMs | 01/01/70 00:00 |