Алексей П писал(а):_abk_ не только для тиниек, а как быть с мегой 8,48,88?
Для Меги8 алгоритм немного другой и он не требует низкого Vtg до подачи Vрр. Для пользы дела позволю себе длинную цитату из даташита - все по полочкам разложено. Вообще, у меня программатор с 8-кой заработал и без "дерганья" Vtg, как вроде помнится. Хотя в окончательном варианте программатора управление Vtg есть, и все что было под рукой программировалось при любых извращениях с фьюзами.
Итак, обещанная цитата:
The following algorithm puts the device in Parallel Programming mode:
1. Apply 4.5 - 5.5V between VCC and GND, and wait at least 100 μs.
2. Set RESET to “0” and toggle XTAL1 at least 6 times
3. Set the Prog_enable pins listed in Table 92 on page 227 to “0000” and wait at
least 100 ns.
4. Apply 11.5 - 12.5V to RESET. Any activity on Prog_enable pins within 100 ns
after +12V has been applied to RESET, will cause the device to fail entering Programming
mode.
Note, if the RESET pin is disabled by programming the RSTDISBL Fuse, it may not be
possible to follow the proposed algorithm above. The same may apply when External
Crystal or External RC configuration is selected because it is not possible to apply qualified
XTAL1 pulses. In such cases, the following algorithm should be followed:1. Set Prog_enable pins listed in Table 92 on page 227 to “0000”.
2. Apply 4.5 - 5.5V between VCC and GND simultaneously as 11.5 - 12.5V is
applied to RESET.
3. Wait 100 ns.
4. Re-program the fuses to ensure that External Clock is selected as clock source
(CKSEL3:0 = 0’b0000) and RESET pin is activated (RSTDISBL unprogrammed).
If Lock Bits are programmed, a chip erase command must be executed before
changing the fuses.
5. Exit Programming mode by power the device down or by bringing RESET pin to
0’b0.
6. Entering Programming mode with the original algorithm, as described above.
