KEYBOARD scanning

I am developing an 8051 based keypad module. Problem i am facing is that program is scanning port very fast so that a simngle keypress will be taken as multiple presses. To over come this a delay was...
KEYBOARD scanning

I am developing an 8051 based keypad module. Problem i am facing is that program is scanning port very fast so that a simngle keypress will be taken as multiple presses. To over come this a delay was...
How to scan strings from keyboard much clever?

I want to scan string from keyboard and display on LCd ,but when scanning the next string ,the buffer for saving pre_string will be changed to the value in scanning buffer,and the display also will be...
How to scan strings from keyboard much clever?

I want to scan string from keyboard and display on LCd ,but when scanning the next string ,the buffer for saving pre_string will be changed to the value in scanning buffer,and the display also will be...
8255 simulation

Is it possible to simulate the 8255 by a plugin or anything else in keil µvision 2 ? Greetings Martin