MC68EC000EI12 Freescale Semiconductor, MC68EC000EI12 Datasheet - Page 97
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MC68EC000EI12
Manufacturer Part Number
MC68EC000EI12
Description
IC MPU 32BIT 12MHZ 68-PLCC
Manufacturer
Freescale Semiconductor
Series
68K - M680X0r
Specifications of MC68EC000EI12
Processor Type
M680x0 32-Bit
Speed
12MHz
Voltage
3.3V, 5V
Mounting Type
Surface Mount
Package / Case
68-PLCC
Core Size
32 Bit
Cpu Speed
12MHz
Digital Ic Case Style
PLCC
No. Of Pins
68
Supply Voltage Range
3V To 3.6V
Operating Temperature Range
0°C To +70°C
Filter Terminals
SMD
Rohs Compliant
Yes
Clock Frequency
12MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68EC000EI12
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Company:
Part Number:
MC68EC000EI12R2
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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Instruction Set Summary
The three additional bits beyond the extended-precision format, the difference between the
intermediate result’s 67-bit mantissa and the storing result’s 64-bit mantissa, allow the FPU
to perform all calculations as though it were performing calculations using a float engine with
infinite bit prec The result is always correct for the specified destination’s data format before
performing rounding (unless an overflow or underflow error occurs). The specified rounding
operation then produces a number that is as close as possible to the infinitely precise
3-26
RN
ROUND AND STICKY = 0
ROUND OR STICKY = 1
GUARD AND LSB = 1,
ADD 1 TO
GUARD = 1
LSB
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
OR
Figure 3-2. Rounding Algorithm Flowchart
ADD 1 TO EXPONENT
SHIFT MANTISSA
RIGHT 1 BIT,
POS
INTERMEDIATE
RM
RESULT
NEG POS
ADD 1 TO
OVERFLOW = 1
LSB
INTERMEDIATE
SELECT ROUNDING MODE
RP
RESULT
.
INEX2 1
GUARD 0
ROUND 0
STICKY 0
NEG
ENTRY
EXIT
AND STICKY ARE
GUARD, ROUND,
AND STICKY BITS = 0
CHOPPED
RZ
GUARD, ROUND,
EXACT RESULT
EXIT
MOTOROLA
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