| ??? 12/26/07 12:33 Modified: 12/26/07 12:40 Read: times |
#148706 - yes schematic shows wrong reset Responding to: ???'s previous message |
schematic shows avr reset, HOWEVER when I use the 89C51, I use an 8.2K resistor from RST to GND, and a 10 uF capacitor from RST to VCC. (i uploaded the new schematic now)
If the avr reset was used, the 89C51 would never boot. I did get the uart routines to work with the terminal, (bypassing the RF module, and connecting an RS232 circuit) Sorry for any confusion this may have caused. I still cannot get the pin to go low. |
| Topic | Author | Date |
| 8051 Port Pin wont go low | 01/01/70 00:00 | |
| Try this | 01/01/70 00:00 | |
| here is the schematic | 01/01/70 00:00 | |
| RC-reset is wrong! | 01/01/70 00:00 | |
| That RST schematic is for AVR , which | 01/01/70 00:00 | |
| yes schematic shows wrong reset | 01/01/70 00:00 | |
| Low state current | 01/01/70 00:00 | |
| I tried this | 01/01/70 00:00 | |
| You should use CMOS | 01/01/70 00:00 | |
| here is the code | 01/01/70 00:00 | |
| signal source is inadequate, code is irrelevant | 01/01/70 00:00 | |
| The 7407 has the same problem ... | 01/01/70 00:00 | |
| would this work? | 01/01/70 00:00 | |
| why not 'H' why 'HC"? | 01/01/70 00:00 | |
| its what I have | 01/01/70 00:00 | |
| H ??? Didn\'t they quit making that in the \'70s? | 01/01/70 00:00 | |
| 74HC04 is working | 01/01/70 00:00 | |
Single transistor | 01/01/70 00:00 | |
| these superfluous facts in the datasheet | 01/01/70 00:00 |