| ??? 02/24/03 18:51 Read: times |
#39941 - RE: 8255 Responding to: ???'s previous message |
Better yes,,,go to the FAQ section / Hardware and read the info there about re-designing away from the 82c55 use. Simpler curcuit will be easier to use and easier to debug. One chip type that is prettu cool for adding outputs to a microcontroller is a device called an 8 bit addressable latch. A part number would be 74HC259. Here is a link to the data sheet for the Toshiba 74HC259.
These are cool becasue you can individually access each bit. When you wire these usually the A-B-C inputs go to address lines and the D input goes to a data line. It is however to also hook the D input to an address line. For example if hookup was... A3 -> 'hc259.C A2 -> 'hc259.B A1 -> 'hc259.A A0 -> 'hc259.Din Then a write to address+0 will clear the bit and a write to address+1 will set the bit. Michael Karas |
| Topic | Author | Date |
| 8255 | 01/01/70 00:00 | |
| RE: 8255 | 01/01/70 00:00 | |
| RE: 8255 | 01/01/70 00:00 | |
| RE: 8255 | 01/01/70 00:00 | |
| RE: 8255 | 01/01/70 00:00 | |
| RE: 8255 | 01/01/70 00:00 | |
| RE: 8255 | 01/01/70 00:00 | |
| RE: 8255 | 01/01/70 00:00 | |
| RE: 8255 | 01/01/70 00:00 | |
| RE: 8255 / the Diodes | 01/01/70 00:00 | |
| RE: 8255 | 01/01/70 00:00 | |
| RE:40xx I<sup>2</sup>C | 01/01/70 00:00 | |
| RE: RE:40xx I<sup>2</sup>C | 01/01/70 00:00 | |
RE: RE:40xx I<sup>2</sup>C | 01/01/70 00:00 | |
| RE: 8255 | 01/01/70 00:00 | |
| RE: 8255 | 01/01/70 00:00 |



