To Tomáš :
Ano, pokud nejsou nastaveny v mikrokontroleru bity, ktere zakazuji cteni. Tyto bity obvykle nastavuji profesionalni vyrobci HW/SW, pokud nechteji, aby doslo vyzrazeni programu a naslednemu kopirovani jejich vyrobku. Takze to zbyva jen zkusit.
Prikladam kopii souvisejiciho anglickeho textu z datasheetu AT89C2051:
On the chip are two lock bits which can be left unprogrammed (U) or can be programmed (P) to
obtain the additional features listed in the Table 8-1.
Note: 1. The Lock Bits can only be erased with the Chip Erase operation.
Table 8-1. Lock Bit Protection Modes(1)
Program Lock Bits
LB1 LB2 Protection Type
1 U U No program lock features
2 P U Further programming of the Flash is disabled
3 P P Same as mode 2, also verify is disabled
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Vyhnal Zdenek