| ??? 02/26/02 15:51 Read: times |
#20160 - RE: what's the need of pullup for P0 "J" |
the whole story (my Capitals):
The pullup FET in the P0 output driver is used ONLY when the port is EMITTING 1s during EXTERNAL MEMORY ACCESSES. Obviously no memory chip would emit blue smoke if fed data during write operations. However, you would destroy some types of memory chips if you pulled a data pin high during read. Erik |
| 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 |