1. Keypad Encoding Using the EDE1144
Jeffery Betts
jdb317
Presentation 21
November 6, 2002

2. High Level -Similar to keyboard decoder - Serial (2400 or 9600 Baud)
- Good for 4X4(16) or less keypads
-Two operating modes
- Serial (2400 or 9600 Baud)
- Parallel

3. Keypad to Keypad Encoder

4. Timing diagram for keypad encoder

5. Basic Wiring Schematic

6. Links -ede1144 http://www.jameco.com/Jameco/Products/ProdDS/171969.pdf
-man seg disp
-74LS48
-74LS173
Texas Instruments, TTL Logic Book Page2-575