| ??? 06/24/08 14:39 Read: times |
#156156 - Connecting /PSEN and /RD directly together |
Hello, everyone,
I've got several uC boards running code form an external ram with its /OE pin controlled by ANDing /PSEN and /RD. I can find no specific information about the two pins /PSEN and /RD, especial not on the P89C591, but I guess, I would be able to connect them directly together, because they're generally pulled up by a weak pull up resistor and only for a short time by a strong pull up resistor, whereby the periods, when one strong pullup resistor is activated and the (strong) pull down of the other pin can never overlap. I'ld like to hear, what the experts say... Thank you, Mike |
| Topic | Author | Date |
| Connecting /PSEN and /RD directly together | 01/01/70 00:00 | |
| 'guess' is not a design criteria | 01/01/70 00:00 | |
| Lots of boards use an AND gate. | 01/01/70 00:00 | |
| nope | 01/01/70 00:00 | |
| I beg your pardon ... | 01/01/70 00:00 | |
| unadulterated male cow manure | 01/01/70 00:00 | |
| Definition is correct | 01/01/70 00:00 | |
| go back to your 1st-year logic text | 01/01/70 00:00 | |
| use your own link and find out you are wrong | 01/01/70 00:00 | |
| Erik, perhaps you just need to learn to read | 01/01/70 00:00 | |
| I\'m not | 01/01/70 00:00 | |
| Erik, all logic is positive | 01/01/70 00:00 | |
| ask Mr Boole | 01/01/70 00:00 | |
| Input and Output is negative logic | 01/01/70 00:00 | |
| re;negative OR | 01/01/70 00:00 | |
| nope | 01/01/70 00:00 | |
| Boring discussion | 01/01/70 00:00 | |
| WRONG!!! | 01/01/70 00:00 | |
| one resistor? | 01/01/70 00:00 | |
| Whats the point ? | 01/01/70 00:00 | |
| You are right. | 01/01/70 00:00 | |
| not necessarily "non-dangerous" | 01/01/70 00:00 | |
delayed with sure, but non overcurrent-ed | 01/01/70 00:00 |