| ??? 03/01/08 00:28 Read: times |
#151700 - AT89S and AT89LP Fuses Responding to: ???'s previous message |
Question:
Erik Malund said:
everything above is about 'fuses' and there are references to 'changing'.
how do you 'change' after a 'fuse' is blown. Erik Answer: Modern microcontrollers use non-volatile embedded memories, which can be erased and re-programmed up to 100 000 times. Fuses are nothing else but privileged locations in such non-volatile embedded memories (like EEPROM or Flash). The AT89ISP software does exactly that (among other things): erasing and re-programming the non-volatile fuses, which retain their data when powered down (as opposed to volatile memory cells, like SRAM, which loose data when powered down). The fuses you mentioned (which are "blown") are of a different kind called OTP (One Time Programmable). AT89S and AT89LP are listed under Flash products, not OTP. |
| Topic | Author | Date |
| Xtal2 (pin 4) AT89S2051 problem | 01/01/70 00:00 | |
| Osc Bypass Fuse for AT89S2051/S4051 | 01/01/70 00:00 | |
| I'm a bit confused | 01/01/70 00:00 | |
| AT89S and AT89LP Fuses | 01/01/70 00:00 | |
| not the old 'H' P89c51Rx2 | 01/01/70 00:00 | |
| there's nothing like fixed terminology... | 01/01/70 00:00 | |
that may be so but .... | 01/01/70 00:00 | |
| 1 external Osc drive 2 Microcontrollers, possible? | 01/01/70 00:00 | |
| I drive 4 with one (external) oscillator | 01/01/70 00:00 |