Posted on May 17, 2011 at 12:06hi,
does the flash return to ''READ MODE'' automaticall (i.e. by timeout) after an error occured during writing/erasing the flash ?
or do I have to set it back to ''READ MODE'' manually by using the ''Reset Flash'' instruction cycle ?
if yes: what happens in the following situation:
- the mcu writes/erases a byte in the flash.
- then, the mcu uses ''data polling'' to test when the operation is completed.
- now, i.e. an interrupt-service-routine interrupts the ''data polling''
- the writing/erasing fails, but the mcu doesn't know this yet, because the interrupt-service-routine is still working.
- the ''data polling'' continues much later, when the flash is in ''READ MODE'' again.
- now: DQ7=old_D7, DQ6=old_D6, DQ5=old_D5
assume that old_D7 = !D7. then the ''data-polling-algorithm'' (as shown on the ''Data Polling Flowchart in the datasheet) results in an infinite loop (because DQ7=!D7, and DQ5=0).
right ?
by the way, the ''data-toggle-algorithm'' works also in this case.
thanks
