MC68EC000EI20 Freescale Semiconductor, MC68EC000EI20 Datasheet - Page 41

• 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: -

Introduction
1.7.3 Organization of Fpu Data Formats in Registers and Memory
The eight, 80-bit floating-point data registers are analogous to the integer data registers and
are completely general purpose (i.e., any instruction may use any register). The MC68040
supports only some data formats and types in hardware. Table 1-8 lists the data formats
supported by the MC68040.
Figure 1-22 illustrates the floating-point data format for the single- , double-, and extended-
precision binary real data organization in memory.
1-30
NOTES:
*
† = Data Format/Type Supported by Software (MC68040FPSP)
Normalized
Zero
Infinity
NAN
Denormalized
Unnormalized
Number
Data Format/Type Supported by On-Chip MC68040 FPU Hardware
Types
7
7
7
BYTEn -1
BYTEn -1
BYTEn -1
Figure 1-22. Organization of FPU Data Formats in Memory
Table 1-8. MC68040 FPU Data Formats and Data Types
Precision
ADDRESS
ADDRESS
Single-
0 7
0 7
0 7
Real
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
†
Precision
Double-
Real
†
0 7
0 7
0 7
EXTENDED-PRECISION REAL
DOUBLE-PRECISION REAL
SINGLE-PRECISION REAL
Extended-
Precision
Real
†
†
0 7
0 7
0 7
.
Data Formats
Packed-
Decimal
Real
†
†
†
†
†
†
0 7
0 7
0 7
Integer
Byte
Integer
0 7
0 7
0 7
Word
BYTEn +4
BYTEn +8
BYTEn +12
Integer
Long-
Word
MOTOROLA
0
0
0