gres
Full Member level 4
I made a mistake or on purpose turned off reset pin (RSTDISBL) or possibility of programming via ISP (SPIEN)? There’s no need to make or buy uncomfortable HV programmer, just for unlock a few processors. This device turn off all problems with fusebits in microcontrollers with series HV – fast and proficiently can set it do factory settings. It can work with all uC VR with series HV interface, so it works with 8 pins : Attiny11, Attiny12, Attiny13, Attiny15, Attiny25, Attiny45, Attiny85 and 14 pins Attiny24, Attiny44, Attiny84.
All is very simple and cheap – brain of the system is Attiny 2313, with a few resistors, transistors, and 5V stabilizer. Power for the system- 12V stabilizer. Repairing process is started by pressing START button. Botton is active again after 250ms and pressing it cause system reset and start again.
Diodes can show:
Green flash – fusebits are repaired and checked, system is ready to wor. If the lockbit secure system is on, it will just return to factory settings
Red flash – problem with signature, no system or no signature at base.
Blinking green – signature is checked, fusebits are not like in original, but lockbits are set and allow to cancel memory is necessary.
Blinking red – signature checked, lockbits off, but for some reasons program cant write new fusebits, System fail after 10 save tries.
Device use high voltages serial programming HVSP. Firstly patient is set to high voltages programming mode, then signature is checked. Next all memory is cancelled if user allow for that by right jumper. Than comes turn for lockbits, and if they are not active, patient get new fusebits.
More information at: https://www.elektroda.pl/rtvforum/topic1570269.html
