Interfacing PIC Microcontrollers

Clear ResLo and ResHi

Loop

Add Num1 to ResLo

If Carry set, increment ResHi

Decrement Num2

Until Num2 = 0

12 Declare registers: Num1, Num2

Load integer into Num1

Complement Num1

Increment Num1

Add Num1 to Num2

Result in Num2

Assessment 6

1 The key code is obtained by taking the row low and checking the column input. If it is

low, the ASCII code is loaded and the scan quit.

2 The code to operate the LCD only needs to be written once, saved and included into

new programs as required, saving time and effort.

3 The negative result is detected when the carry flag is cleared. A minus sign character is

displayed, and the inverse 2s complement of the result calculated ...