Getting Started

Chapter 4: C Types, Operators, and Expressions

1111000 = 248

00000001 = 1 1111001 = 249

111010 = 250

1111011 = 251

00000110 = 6 1111110 = 254

1111111 = 255

ere random, we’d just see the

aotically. Using binary numbers where the lit LED is

00100000 = 0x20 = 32

microcontroller applications, we will often be dealing with the states of byte-
sized p case

00000000 = 0

00000010 = 2 1

00000011 = 3 (9 thru 247)

00000100 = 4 1111100 = 252

00000101 = 5 1111101 = 253

00000111 = 7

00001000 = 8

Look at our Cylon eye and notice that we have 8 LEDs with one lit at a time
scrolling back and forth. What you are seeing is 8 of the 256 possible states being
presented in a sequence that fools us into thinking we are seeing a back and forth
scrolling motion. If the presentation sequence w
light blinking on and off ch
represented by 1 shown next to the hexadecimal and decimal equivalent, what we
are seeing is:

00000001 = 0x01 = 1

00000010 = 0x02 = 2

00000100 = 0x04 = 4

00001000 = 0x08 = 8

00010000 = 0x10 = 16

00100000 = 0x20 = 32

01000000 = 0x40 = 64

10000000 = 0x80 = 128

01000000 = 0x40 = 64

00010000 = 0x10 = 16

00001000 = 0x08 = 8

00000100 = 0x04 = 4

00000010 = 0x02 = 2

00000001 = 0x01 = 1

In
orts, like Port D. A port is a place where ships come and go, or in the