This document discusses arithmetic and logical operations in C programming for embedded systems. It defines common arithmetic operations like addition, subtraction, multiplication and division. It also defines logical operators like AND, OR, NOT and bitwise operators like &, |, ^, ~. Examples are given of how to use these operations to manipulate data stored in ports and shift bits. Code samples are provided to demonstrate performing logic operations on values and shifting bits in C.

1. DR. VIKAS J. DONGRE
HOD ELECTRONICS & TELECOM
GOVERNMENT POLYTECHNIC WASHIM (MS)
EMAIL: DONGREVJ1@GMAIL.COM

2. Arithmetic operations
• Add +
• Subtract –
• Multiply *
• Divide /
• Mod %

3. #include <reg51.h>
void main(void)
{
unsigned char a,b,c;
while(1)
{
P1=0xff;
P2=0xff;
a=P1;
b=P2;
c=a+b;
P3=c;
}
}

4. Logical operations
 Logical operators
 AND (&&), OR (||), and NOT (!)
 Bit-wise operators
 AND (&), OR (|), EX-OR (^), Inverter (~), Shift Right
(>>), and Shift Left (<<)
 These operators are widely used in software
engineering for embedded systems and control

5. AND OR EX-OR Inverter
A B A&B A|B A^B ~B
0 0 0 0 0 1
0 1 0 1 1 0
1 0 0 1 1
1 1 1 1 0
Bit-wise Logic Operators for C

6. Examples of shifting
P1= 0x9A >> 3;
P2= 0x77 >> 4;
P0= 0x6 << 4;

7. Logic Operations in C
#include <reg51.h>
void main (void)
{
P0= 0x35 & 0x0F;
P1= 0x04 | 0x68;
P2= 0x54 ^ 0x78;
P0= ~0x55;
P1= 0x9A >> 3;
P2= 0x77 >> 4;
P0= 0x6 << 4;
}