| ??? 11/29/07 08:55 Read: times |
#147549 - Memory mapped! Responding to: ???'s previous message |
So the base address is defined by whatever decoding logic you've used to drive the chip-select, /CS.
In the example on Richard's user page, it tells you the address range that his arrangement uses: 0xFFFC to 0xFFFF http://www.8052.com/users/richard/ You now need to read the Datasheet for the 8255 to see how those addresses are mapped to the ports (and to the control registers)... |
| 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 |