| ??? 02/25/08 19:14 Read: times |
#151444 - That's why it's so unhelpful! Responding to: ???'s previous message |
Chris Bertrand said:
Like a standard 8051 is
0xFF for PX to be an input This highlights precisely why the above is so unhelpful! The standard 8051 port structure is always and only Quasi-bidiredctional - it does not have specifically configurable "input" and "output" modes. This is important when you contrast it to other processors, and derivatives like the LPC series which do have non-standard ports that can be specifically configured as "input" (only) or "output" (only). See: http://www.8052.com/faqs.phtml?FAQ=120176 |
| Topic | Author | Date |
| Port I/O programming for 89LPC935 and others | 01/01/70 00:00 | |
| Is this enough info/hint | 01/01/70 00:00 | |
| Still ???? | 01/01/70 00:00 | |
| this is NOT a 'standard '51 | 01/01/70 00:00 | |
That's why it's so unhelpful! | 01/01/70 00:00 | |
| what about the "user manual' | 01/01/70 00:00 | |
| | 01/01/70 00:00 | |
| Quasi-bidirectional | 01/01/70 00:00 |