| ??? 10/30/01 17:39 Read: times |
#16162 - T89c51Rd2 eeprom reads 0 until written |
My T89C51RD2 reads "00" for every eeprom
address until I write any byte anywhere in the eeprom. If I execute the write routine with the "52 -A2" command commented out, it still reads eveything as "00", so I do not think I am using the SFR's wrong. Un-commenting the "52->A2" command allows the write to occur, and from then on I can read from the eeprom normally, until a reset or power fail. Has anyone seen this problem before ? To answer the obvious: I set EECON to 0x02 before reading, every time. AUXR is untouched. I verified the listing, and it is writing/reading in a way consistent with the datasheet. (dptr access to XDATA, etc.) |
| Topic | Author | Date |
| T89c51Rd2 eeprom reads 0 until written | 01/01/70 00:00 | |
RE: T89c51Rd2 eeprom reads 0 until written | 01/01/70 00:00 |