Prompt user on the Dispay to Enter a 4 digit code to the Keypad, that displays to the 16 x 2 display, that then unlocks some stored value in ROM, which if correct displays all I I Ds as ON to indicate that the (ode was successful, otherwise displays alternating on/off LEDs indicating it was unsuccessful and to try again.

Answer rating: 100% (QA)

CODING lcdport equ P3 en equ P37 rs equ P35 lock equ P13 LCDCLR equ 01H LCDLN1 equ 80H LCDLN2 equ 0C0H LOCKi equ 0 UNLOCKi equ 1 EXi equ 2 OKi equ 3 var1 equ r2 temp equ r3 delay equ r4 scan equ r5 is... View the full answer