| ??? 02/26/02 17:46 Read: times |
#20172 - RE: what\\\'s the need of pullup for P0 \\ |
"I have found that pullups ARE needed for accessing external ram, in at least one variant, despite what the datasheet says, when running from internal code and using external ram"
"I would like to know which RAM you are talking about since I have never had the problem." A simple cy7c199. What I think i remember I observed was... if there was a "1" on the databus prior to writing to ram, it wrote the correct value. So, the data written was a logical and of the lower 8 address bits, and the data that should have been written. It was a t89c51rd2 running internal code. |
| Topic | Author | Date |
| what's the need of pullup for P0 | 01/01/70 00:00 | |
| RE: what's the need of pullup for P0 | 01/01/70 00:00 | |
| RE: what's the need of pullup for P0 | 01/01/70 00:00 | |
| RE: what\'s the need of pullup for P0 | 01/01/70 00:00 | |
| RE: what's the need of pullup for P0 "J" | 01/01/70 00:00 | |
| RE: what's the need of pullup more | 01/01/70 00:00 | |
| RE: what\\\'s the need of pullup more | 01/01/70 00:00 | |
| RE: what\\\'s the need of pullup more | 01/01/70 00:00 | |
| RE: what's the need of pullup Philip | 01/01/70 00:00 | |
| RE: what\\\'s the need of pullup more | 01/01/70 00:00 | |
| RE: what's the need of pullup for P0 "J" | 01/01/70 00:00 | |
| RE: what's the need of pullup Philip | 01/01/70 00:00 | |
| RE: what\\\'s the need of pullup for P0 \\ | 01/01/70 00:00 | |
| RE: what's the need of pullup Philip | 01/01/70 00:00 | |
| RE: what is float state-phillip | 01/01/70 00:00 | |
| RE: what's the need of pullup Philip | 01/01/70 00:00 | |
| RE: what\\\'s the need of pullup for real | 01/01/70 00:00 | |
RE: what is float state-phillip | 01/01/70 00:00 |