MC68EC000EI20 Freescale Semiconductor, MC68EC000EI20 Datasheet - Page 97
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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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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