| ??? 05/29/08 20:59 Read: times |
#155263 - Memory mapping Responding to: ???'s previous message |
Raghunathan said
AD0 to AD7 will be connected to Port 3 of the MCU. Control pins AS, R/!W, DS, !CS, will be connected to spare port pins in P1 port.
Will the idea work ? Anyday.I think Mehdi posted codes here. Right now I am enjoying memory mapped DS12C887 taking my movx codes. This chip is beauty.Dear Raghunathan I hope you appreciate that DS12c887 needs only a 40 pinnner 8051 ONLY...no 138 for I kept it always selected.. no 373/573, and there you are.So I connect '887 and LCD to pulled up P0.LCD is not memory mapped,unlike the EFY project.If needed I can post the working circuit. With best regards A.S.Rudra |
| Topic | Author | Date |
| DS12C887 with non mux interface | 01/01/70 00:00 | |
| Throw that junk away... | 01/01/70 00:00 | |
| Search For... | 01/01/70 00:00 | |
| A full circle.. | 01/01/70 00:00 | |
| just did the same thing yesterday! | 01/01/70 00:00 | |
| Why would anyone call you crazy ? | 01/01/70 00:00 | |
| nop's | 01/01/70 00:00 | |
| The full C code for the DS12887 | 01/01/70 00:00 | |
| just curious | 01/01/70 00:00 | |
| Selectable bus timings | 01/01/70 00:00 | |
| I agree with Michael... | 01/01/70 00:00 | |
Are there any specific reasons ?? | 01/01/70 00:00 | |
| what does datasheet says | 01/01/70 00:00 | |
| Memory mapping | 01/01/70 00:00 | |
| Craig, which lead to the old issue | 01/01/70 00:00 |