4X4 Key Pad Scanning.

[Code Warrior]

Hello,
I want to attach 4X4 key pad to AT89S52 on port P0. Please suggest me code in assembly as well as in C. So I can experiment on the same. Please do the need full.

 

[IanP]

'ASM':
**broken link removed**
All what you need to do is to change P1.0 to P0.0 .. and so on .. and don't forget about 8x10kΩ pullups on PORT0 ..

'C':
http://www.blitzlogic.com/kbd_C.HTM

Regards,
IanP

 

[Code Warrior]

Thanks IanP for help. Can you suggest me how to write keyboard code for 8051 in C.