MC68EC000EI20 Freescale Semiconductor, MC68EC000EI20 Datasheet - Page 27
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MC68EC000EI20
Manufacturer Part Number
MC68EC000EI20
Description
IC MPU 32BIT 20MHZ 68-PLCC
Manufacturer
Freescale Semiconductor
Specifications of MC68EC000EI20
Processor Type
M680x0 32-Bit
Speed
20MHz
Voltage
3.3V, 5V
Mounting Type
Surface Mount
Package / Case
68-PLCC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
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Introduction
1.5.2 Binary Floating-Point Formats
Figure 1-12 illustrates the three binary floating-point data formats. The exponent in the three
binary floating-point formats is an unsigned binary integer with an implied bias added to it.
When subtracting the bias from the exponent’s value, the result represents a signed twos
complement power of two. This yields the magnitude of a normalized floating-point number
when multiplied by the mantissa. A program can execute a CMP instruction that compares
floating-point numbers in memory using biased exponents, despite the absolute magnitude
of the exponents.
Data formats for single- and double-precision numbers differ slightly from those for
extended-precision numbers in the representation of the mantissa. For all three precisions,
a normalized mantissa is always in the range (1.0...2.0). The extended-precision data format
represents the entire mantissa, including the explicit integer part bit. Single- and double-
precision data formats represent only a fractional portion of the mantissa (the fraction) and
always imply the integer part as one.
1-16
S
94
EXPONENT
SIGN OF MANTISSA
15-BIT
NOTE: XXXX indicates “don't care", which is zero when written and ignored when
96
SM
32
DIGIT 15
DIGIT 7
SE
80
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
Figure 1-12. Binary Floating-Point Data Formats
Y Y
read.
ZERO
Figure 1-11. Packed Decimal Real Format
DIGIT 14
DIGIT 6
EXP 0
SIGN OF MANTISSA
SIGN OF EXPONENT
USED ONLY FOR ± INFINITY OR NANS
63
S
62
DIGIT 13
DIGIT 5
EXPONENT
EXP 1
EXPLICIT INTEGER PART BIT
SIGN OF FRACTION
11-BIT
DIGIT 12
DIGIT 4
EXP 0
51
.
.
DIGIT 11
DIGIT 3
(EXP 3)
MANTISSA
64-BIT
S
30
FRACTION
EXPONENT
IMPLICIT DECIMAL POINT
52-BIT
DIGIT 10
DIGIT 2
SIGN OF FRACTION
XXXX
8-BIT
22
DIGIT 9
DIGIT 1
XXXX
FRACTION
23-BIT
DIGIT 16
DIGIT 8
DIGIT 0
0
0
0
SINGLE REAL
DOUBLE REAL
EXTENDED REAL
65
0
MOTOROLA
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