| ??? 11/20/03 12:29 Read: times |
#59102 - RE: 89c55wd project question. Responding to: ???'s previous message |
Steve,
The rtc is not a I2C or other serial rtc, so I guess Eric is forced into using using external memory, as he has to map his RTC in external memory... Say goodbye to port 0 and 2.... Hence my suggestion to use LCD in 4-bit mode, as this way you need 4 I/O-pins for the data, and another 3 for control lines to LCD (That would eat up another 7 pins of the remaining 16...) Leaves Eric with 9 spare pins, to be used for wahtever other requirement, but I guess he needs to scan some keys also... regards Patrick (hope I didn't miss any caps... ;-)) |
| Topic | Author | Date |
| 89c55wd project question. | 01/01/70 00:00 | |
| RE: 89c55wd project question. | 01/01/70 00:00 | |
| RE: 89c55wd project question. | 01/01/70 00:00 | |
| RE: 89c55wd project question. | 01/01/70 00:00 | |
| RE: 89c55wd project question. | 01/01/70 00:00 | |
| RE: 89c55wd project question. | 01/01/70 00:00 | |
| RE: 89c55wd project question. | 01/01/70 00:00 | |
| RE: 89c55wd project question. | 01/01/70 00:00 | |
| RE: 89c55wd project question. | 01/01/70 00:00 | |
| RE: 89c55wd project question. | 01/01/70 00:00 | |
| RE: 89c55wd project question. | 01/01/70 00:00 | |
| RE: 89c55wd project question. | 01/01/70 00:00 | |
| RE: 89c55wd project question. | 01/01/70 00:00 | |
| RE: 89c55wd project question. | 01/01/70 00:00 | |
| RE: 89c55wd project question. | 01/01/70 00:00 | |
| RE: 89c55wd bad choice | 01/01/70 00:00 | |
| RE: 89c55wd bad choice | 01/01/70 00:00 | |
| RE: 89c55wd bad choice | 01/01/70 00:00 | |
| Ouch | 01/01/70 00:00 | |
RE: 89c55wd bad choice | 01/01/70 00:00 | |
| RE: 89c55wd project question. | 01/01/70 00:00 |