| ??? 11/29/07 08:16 Read: times |
#147543 - Is only Richard allowed to reply, then? Responding to: ???'s previous message |
Justin Norman said:
Looking over "expanded io" using the 8255 Aha - afraid to mention the 8255 in the thread title, eh...? ;-) Presumably you are aware of the issues, then? i have a little code in C to address P3.7 as an output in the standard way (non expanded) You mean P3.7 of the microcontroller itself? how do you find or know what the address of each bit will be after expansion ? You mean the bits in the ports of the 8255? That would depend entirely on how you've connected the 8255 to your microcontroller! As you haven't given any information on that, it's impossible to say! Is it memory-mapped into XDATA, or are you just controlling it with port pins? Or what? |
| Topic | Author | Date |
| Q for Richard Erlacher | 01/01/70 00:00 | |
| Is only Richard allowed to reply, then? | 01/01/70 00:00 | |
| Not afraid! | 01/01/70 00:00 | |
| How is the 8255 connected? | 01/01/70 00:00 | |
| I'll just go look at the user page. | 01/01/70 00:00 | |
| You mean this? | 01/01/70 00:00 | |
| XDATA | 01/01/70 00:00 | |
| Memory mapped! | 01/01/70 00:00 | |
| Sarcasm not in short supply! | 01/01/70 00:00 | |
| questions with questions | 01/01/70 00:00 | |
| I am just a lowly noob... | 01/01/70 00:00 | |
| memory mapped antique - beware ... | 01/01/70 00:00 | |
| if we do the usual guesswork... | 01/01/70 00:00 | |
| Spanish | 01/01/70 00:00 | |
| Your question is vague and confusing! | 01/01/70 00:00 | |
| Thankyou Richard and Andy. | 01/01/70 00:00 | |
No worries, mate! | 01/01/70 00:00 |