# Number Systems & Encoding

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1 Number Systems & Encoding Lecturer: Sri Parameswaran Author: Hui Annie Guo Modified: Sri Parameswaran Week2 1

2 Lecture overview Basics of computing with digital systems Binary numbers Floating point numbers Encoding BCD ASCII Others Week2 2

3 Week2 3 Number representation Any number can be represented in the form of r a 0 : radix,base r r a... r a a r a... r a r a )...a.a a...a a (a i m m n 1 n n n r -m n n

4 Decimal Example (3597) The place values, from right to left, are 1, 10, 100, 1000 The base or radix is 10 All digits must be less than the base, namely, 0~9 Week2 4

5 Binary Example (1011) The place values, from right to left, are 1, 2, 4, 8 The base or radix is 2 All digits must be less than the base, namely, 0~1 What are the first 16 binary integers? Week2 5

6 Hexadecimal Example (F24B) 16 F The place values, from right to left, are 1, 16, 16 2, 16 3 The base or radix is All digits must be less than the base, namely, 0~9,A,B,C,D,E,F B Week2 6

7 Which numbers to use? Digital machines use binary numbers Because digital devices can easily produce high or low level voltages, which can represent 1 or 0. Hexadecimals or sometimes octal numbers are used For neat binary representation For easy number conversion between binary and decimal Humans are familiar with decimals Week2 7

8 Number conversion From base r to base 10 Using (a n a n1...a 1 a 0.a -1...a -m ) r a n r n a n1 r n1... a 1 r a 0 a -1 r 1... a m r m Examples: Week2 8

9 Examples From base (1011.1) From base (1005.2) From base 16 2 (10A) Week2 9

10 Number conversion From base 10 to base r Based on the formula (a a...a a.a...a ) n n m r a n r n a n1 r n1... a 1 r a 0 a -1 r 1... a m r m For whole number Divide the number/quotient repeatedly by r until the quotient is zero and the remainders are the digits of base r number, in reverse order For fraction Multiply the number/fraction repeatedly by r, the whole numbers of the products are the digits of the base r fraction number Week2 10

11 Examples To base 2 To convert (11.25) 10 to binary For whole number (11) 10 division (by 2) For fraction (0.25) 10 multiplication (by 2) (11.25) 10 =( ) 2 Week2 11

12 Examples To base 8 To convert (99.25) 10 to octal For whole number (99) 10 division (by 8) For fraction (0.25) 10 multiplication (by 8) (99.25) 10 =(143.2) 8 Week2 12

13 Examples To base 16 To convert (99.25) 10 to hexadecimal For whole number (99) 10 division (by 16) For fraction (0.25) 10 multiplication (by 16) (99.25) 10 =(63.4) hex Week2 13

14 Number conversion Between binary and octal Direct mapping based on the observation: (abcdefgh. jklmn) (a 2 (f 2 (0ab (jkl 2 2 (m2 2 2 ) 8 ) 8 b) n 2 2 g 2 h) (c2 (cde 2 (mn0 0) 2 2 The expressions in parentheses, being less than 8, are the octal digits. 2 (j2 6 ) 8 1 ) 8 d 2 2 (fgh 2 e) 2 k 2 2 ) 8 Week l) 2 3

15 Number conversion Between binary and octal (cont.) Binary to octal The binary digits ( bits ) are grouped from the radix point, three digits a group. Each group corresponds to an octal digit. Octal to binary Each of octal digits is expanded to three binary digits Week2 15

16 Examples Binary to octal Convert ( ) 2 to octal: Note: = = Whole number parts are grouped from right to left. The leading 0 is optional Fractional parts are grouped from left to right and padded with 0s Week2 16

17 Examples Octal to binary Convert to binary : = = Note: For whole number parts, the leading 0s can be omitted. For fractional parts, the trailing 0s can be omitted. Week2 17

18 Number conversion Between binary and hexadecimal Binary to hexadecimal The binary digits ( bits ) are grouped from the radix point, four binary digits a group. Each group corresponds to a hexadecimal digit. Hexadecimal to binary Each of hexadecimal digits is expanded to four binary digits Week2 18

19 Examples Binary to hexadecimal Convert to hexadecimal : Note: = A C = AC Whole number parts are grouped from right to left. The leading 0 is optional Fractional parts are grouped from left to right and padded with 0s Week2 19

20 Examples Hexadecimal to binary Convert 2F6A to binary : 2 F 6 A = = Note: For whole number parts, the leading 0s can be omitted. For fractional parts, the trailing 0s can be omitted. Week2 20

21 Conversion to binary via octal The direct conversion of to binary looks like this and gives It may be quicker to convert to octal first yielding , which can be instantly converted to Week2 21

22 Binary arithmetic operations Similar to decimal calculations Examples of addition and multiplication are given in the next two slides. Week2 22

23 Binary additions Example: Addition of two 4-bit unsigned binary numbers. How many bits are required for holding the result? = ( ) Week2 23

24 Binary multiplications Example: Multiplication of two 4-bit unsigned binary numbers. How many bits are required for holding the result? 1001*0110 = ( ) Week2 24

25 Negative numbers & subtraction Subtraction can be defined as addition of the additive inverse: a b = a + (-b) To eliminate subtraction in binary arithmetic, we can represent b by 2 s complement of b. In n-digit binary arithmetic, 2 s complement of b is (b*)* = b b* = 2 n b The MSB (Most Significant Bit) of a 2 s complement number is the sign bit For example, for a 4-bit 2 s complement system, (1001) -7, (0111) 7 Week2 25

26 Examples -- 2 s complement numbers Represent the following decimal numbers using 8-bit 2 s complement format (a) 0 (b) 7 (c) 127 (d) -12 Can all the above numbers be represented by 4-bits? Week2 26

27 Examples 4-bit 2 s-complement additions/subtractions (1) (5-2): (= 0010*) = (2) (2-5): (= 0101*) = 1101 (= 0011*). Result means -3. (3) (-5-2): 1011 (= 0101*) (= 0010*) = Result is 0111* (how?) and means -7. (4) (5 + 2): This is trivial, as no conversions are required. The result is 0111 (= 7). Week2 27

28 Overflow in two s-complement Assume a, b are positive numbers in an n-bit 2 s complement systems, For a+b If a+b > 2 n-1-1, then a+b represents a negative number; this is positive overflow. For -a-b If a-b < 2 n -1, then a-b results in a positive number; this is negative overflow. Week2 28

29 Positive overflow detection Addition of 4-bit positive numbers without overflow looks like this: 0xxx + 0xxx = 0xxx. The carry in to the MSB must have been 0, and the carry out is 0. Positive overflow looks like this: 0xxx + 0xxx = 1xxx. The carry in to the MSB must have been 1, but the carry out is 0. Overflow occurs when carry in carry out. Week2 29

30 Negative overflow detection Addition of negative twos-complement numbers without overflow: 1xxx + 1xxx = 11xxx. The carry in to the MSB must have been 1 (otherwise the sum bit would be 0), and the carry out is 1. Negative overflow: 1xxx + 1xxx = 10xxx. The carry in to the MSB must have been 0, but the carry out is 1. So negative overflow, like positive, occurs when carry in carry out. Week2 30

31 Overflow detection For n-bit 2 s complement systems, condition of overflow for both addition and substraction: The MSB has a carry-in different from the carryout Week2 31

32 Examples 1. Do the following calculations, where all numbers are 4-bit 2 s complement numbers. Check whether there is any overflow. (a) (b) (c) Week2 32

33 Floating point numbers Example Integer Exponent 1.01 x 2-12 Radix (base) Binary point Normal Form +(-) 1.x * 2 y Things to be encoded: sign bit significant exponent sign bit significand exponent Week2 33

34 IEEE 754 FP standard single precision Sign bit Biased Exponent Significand bits S EEEEEEEE FFFFFFFFFFFFFFFFFFFFFFF Bit 31 for sign S=1 for negative numbers, 0 for positive numbers Bits for biased exponent The real exponent = E is called bias. Bits 0-22 for significand Week2 34

35 IEEE 754 FP Standard Single Precision (cont.) The value, v, of the FP representation is determined as follows: If 0<E<255 then V=(-1) S * 2 E-127 * 1.F where "1.F" is intended to represent the binary number created by prefixing F with an implicit leading 1 and a binary point. If E = 255 and F is nonzero, then V=NaN ("Not a number") If E = 255 and F is zero and S is 1, then V= -Infinity If E = 255 and F is zero and S is 0, then V=Infinity If E = 0 and F is nonzero, then V=(-1) S * * 0.F. These are unnormalized numbers or subnormal numbers. If E = 0 and F is 0 and S is 1, then V=-0 If E = 0 and F is 0 and S is 0, then V=0 Week2 35

36 IEEE 754 FP Standard Single Precision (cont.) Subnormal numbers reduce the chance of underflow. Without subnormal numbers, the smallest positive number is With subnormal numbers, the smallest positive number is *2-126 =2 (126+23) =2-149 Week2 36

37 Floating point additions Given two decimal values (a) (b) a = b = 9.5 What are their IEEE format representations? How to calculate a+b in the IEEE format? And what is the result? Week2 37

38 Encoding Beside numbers, a computer machine needs to represent all types of information it is to process. Examples: Week2 38

39 Example 1 To encode a decimal digit with 7 digits for 7- segment display S5 S4 S0 S6 S3 S1 S2 A B C D S 0 S 1 S 2 S 3 S 4 S 5 S x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x Week x x x x x x x

40 Example 2 To encode the locations in a memory. Assume the memory size is 2kB with (2 Bytes/location) locations Binary encoding 10-bit Week2 40

41 Binary codes for decimal digits Can be coded with 4-bit binary numbers Common ones: BCD Decimal 8,4,2,1 Excess3 8,4, - 2, - 1 Gray Week2 41

42 ASCII American Standard Code for Information Interchange. Enable computers and computer programs to exchange information Provide 256 codes Standard Extended Nearly every computer uses American Standard Code for Information Interchange (ASCII) Week2 42

43 ASCII No. char No. char No. char No. char No. No. char P 96char ` 112 p 33! A 81 Q 97 a 113 q 34 " B 82 R 98 b 114 r 35 # C 83 S 99 c 115 s / 63? 79 O 95 _ 111 o 127 DEL Uppercase + 32 = Lowercase (e.g, B+32=b) tab=9, carriage return=13, backspace=8, Null=0 Week2 43

44 Strings Characters normally combined into strings, which have variable length e.g., How to represent a variable length string? 1st position of string reserved for length of string (Pascal) an accompanying variable has the length of string (as in a structure) last position of string is indicated by a character used to mark end of string C uses 0 (Null in ASCII) to mark the end of a string How to represent PASS? Week2 44

45 Reading Material Appendix A in Microcontrollers and Microcomputers. Week2 45

46 Questions 1. Do the following calculations by changing the given decimal numbers to 8-bit 2 s complement numbers and then performing the indicated operation on the 2 s complement numbers. Were there any 2 s complement overflows? (a) (+127)+(-127) (b) (-50)-(-100) (c) (+75)+(126) Week2 46

47 Questions 2. How to represent number (-13) (a) in 8-bit 2 s complement format (what is the minimum number bits required for such number?) (b) IEEE 32-bit FP format Week2 47

48 Questions 3. Find the equivalent numbers. (a) ( ) 2 s complement = ( ) Hex (b) 25 hex = ( ) 2 (c) ( ) BCD = ( ) 2 (d) ( ) 2 = ( ) 8 Week2 48

49 Questions 4. How many bits do you need to represent a~z 26 letters and 0~9 ten digits? Why? 5. A 32-bit address is given in hexadecimal format 0X2468BAFF, what is the address in binary form? 7. Convert the 8-bit two s complement numbers and to the equivalent 16- bit two s complement numbers. Week2 49

50 Some Programming Examples /* Example 1: Reading a value from a memory location and write that back into another location */ /* The header file to include */.include "m2560def.inc" ldi r16,10 //Loading a value of 10 into register r16 sts 0x000206,r16 //Storing the value in r16 into the memory location lds r17,0x //Loading the value in into register r17 sts 0x00020C,r17 //Storing the value in r17 into the memory location 00020C loop: rjmp loop //An infinite loop to end the program for AVR... /* The values can be observed in the Memory window...view ->Memory ->data*/ Week2 50

51 /* Example2: Copy an Array into another array.. The array is considered as a sequence of memory blocks..*/ /* The header file to include */.include "m2560def.inc" /**** Storing some values into the array memory locations *****/ ldi r16,10 sts 0x000200,r16 ldi r16,11 sts 0x000201,r16 ldi r16,12 sts 0x000202,r16 ldi r16,13 sts 0x000203,r16 ldi r16,14 sts 0x000204,r16 /*****Copying the array from memory into another array *********/ lds r16,0x sts 0x000205,r16 lds r16,0x sts 0x000206,r16 lds r16,0x sts 0x000207,r16 lds r16,0x sts 0x000208,r16 lds r16,0x sts 0x000209,r16 loop: rjmp loop //infinte loop... Week2 51

52 /* Example3: Add two arrays and store it a new array.. The array is considered as a sequence of memory blocks... */ /* The header file to include */.include "m2560def.inc" /**** Storing some values into the first array...*****/ ldi r16,10 sts 0x000200,r16 ldi r16,11 sts 0x000201,r16 ldi r16,12 sts 0x000202,r16 ldi r16,13 sts 0x000203,r16 ldi r16,14 sts 0x000204,r16 /**** Storing some values into the second array...*****/ ldi r16,15 sts 0x000205,r16 ldi r16,16 sts 0x000206,r16 ldi r16,17 sts 0x000207,r16 ldi r16,18 sts 0x000208,r16 ldi r16,19 sts 0x000209,r16 Week2 52

53 Example3 cont d /* Retrieving the values from the array add the values together and write them back into another array */ lds r16,0x //value taken from the first array lds r17,0x //value taken from the second array add r16,r17 //adding the values together sts 0x00020A,r16 //storing the value into another array lds r16,0x lds r17,0x add r16,r17 sts 0x00020B,r16 lds r16,0x lds r17,0x add r16,r17 sts 0x00020C,r16 lds r16,0x lds r17,0x add r16,r17 sts 0x00020D,r16 lds r16,0x lds r17,0x add r16,r17 sts 0x00020E,r16 loop: rjmp loop Week2 53

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