| ??? 08/11/08 16:29 Read: times |
#157403 - Read my post again Responding to: ???'s previous message |
i don't know your application but a 8X8 keypad uses 2 full ports, and if you are using LCD(8 bit mode- 11pins)that leaves you with 5 port pins.
it would be a better idea to use a AT computer keyboard(only two port pins - Sclk,SData)or RC5 remote(only one port pin) to save port pins. just a suggestion ! when nothing is mentioned about the type of derivative used one normally assumes a standard 40 pin 12 cycle 8051 with 32 I/O 2 full port = 16 pins LCD(8 bit mode)= 11pins unused pins = 5 and there's plenty of other serial interface options... i never said that mine was the only solution, my last statement clearly says " just a suggestion" and not "THE SOLUTION" |
| Topic | Author | Date |
| keypad | 01/01/70 00:00 | |
| 4x4 keyboard | 01/01/70 00:00 | |
| complex problem ? | 01/01/70 00:00 | |
| or to save Port pins | 01/01/70 00:00 | |
| Unwarranted assumptions? | 01/01/70 00:00 | |
| Read my post again | 01/01/70 00:00 | |
which, today, is silly | 01/01/70 00:00 | |
| 8x8 key pad | 01/01/70 00:00 | |
| Make a keyboard encoder | 01/01/70 00:00 |