Help me make an interface between AT89C251 and keyboard

[sokrat]

hi all

i want to make interface between at89c251 and keyboard any one can helpe me about keyboard ? :?:


thanks

S 8O KRAT

 

[Nick C.]

ede1188 pic

Here is a good starting point.

**broken link removed**

Nick C.

 

[sokrat]

thanks

thanks nick c

it is good start
but any example or source code with pic family and i want at89c2051 or 8051 family

thanks

yours

S 8O KRAT

 

[Nick C.]

Here are a few more links that I hope may help:

http://mpucoder.kewlhair.com/DOS-soft/8051.html

**broken link removed**

Nick C.

 

[Nick C.]

One more....


**broken link removed**


Nick C.

 

[sokrat]

thanks

nick c


thanks but this links not enough



thanks

YOURS

S 8O KRAT

 

[tanuki]

Cypress has reference designs for USB Hub and Keyboard combination. Example code of the keyboard interface is very hard to find.

Take a look

https://www.cypress.com/support/ref...AF49D&tid=54A040FA-2262-424A-B14741267CBD1308

 

[meax98]

Take look at this keypad (up to 64 keys) encoder. EDE1188.

**broken link removed**

The EDE1188 Keypad Encoder IC is designed to interface a matrix-type 8 row x 8 column (64 key or less) keypad to a microcontroller or other host processor. A one-wire serial or eight-wire parallel interface returns the keypress data and can be used in conjunction with a 'data valid' signal for polled or interrupt-driven applications. The EDE1188 provides enhanced keypad features such as contact debouncing and key auto-repeat in an easy-to-use package that will lower software overhead in the host microcontroller and reduce the I/O pin requirements from sixteen to one, frequently resulting in the use of a less costly host microcontroller in your design.

regards
meax98