| ??? 01/11/12 20:21 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#185437 - no, you can't Responding to: ???'s previous message |
If you can find a solid specification for exactly how long the RESET/nRESET pin on your particular MCU must be held high or low, then, with the aid of a calculator and a schmidt-trigger inverter, you can fabricate a circuit that produces a sufficiently long active-high/low pulse of appropriate voltage and stability during both power-up/power-down conditions and occasional brownouts, should they occur.
no, you can't a) a schmitt trigger requires a minimum Vdd and thus the output is unknown at low Vdd b) there is no way in hades a RC circuit with or without a schmitt trigger can generate a reset at power down Erik |
| Topic | Author | Date |
| AT89ISP Reset Pin Issue | 01/01/70 00:00 | |
| If you want a positive-going RESET ... | 01/01/70 00:00 | |
| no, you can't | 01/01/70 00:00 | |
| You can do it, though you may not want to | 01/01/70 00:00 | |
| The AT89ISP will expect active-high RESET | 01/01/70 00:00 | |
| Try to run the initialize target command... | 01/01/70 00:00 | |
By the way... | 01/01/70 00:00 |