MC68EC000EI16 Freescale Semiconductor, MC68EC000EI16 Datasheet - Page 409

• Manufacturer Part Number: MC68EC000EI16
• Description: IC MPU 32BIT 16MHZ 68-PLCC
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC000EI16

• Processor Type: M680x0 32-Bit
• Speed: 16MHz
• Voltage: 3.3V, 5V
• Mounting Type: Surface Mount
• Package / Case: 68-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

FSCALE
Operation:
Assembler
Syntax:
Attributes:
Description: Converts the source operand to an integer (if necessary) and adds that integer
Operation Table:
MOTOROLA
to the destination exponent. Stores the result in the destination floating-point data
register. This function has the effect of multiplying the destination by 2
much faster than a multiply operation when the source is an integer value.
In Range + –
Zero + –
Infinity + –
The floating-point coprocessor assumes that the scale factor is an integer value before
the operation is executed. If not, the value is chopped (i.e., rounded using the round-
to-zero mode) to an integer before it is added to the exponent. When the absolute value
of the source operand is
NOTES:
1. If the source operand is a NAN, refer to 1.6.5 Not-A-Numbers for more information.
2. Returns the value of FPn before the operation. However, the result is
3. Sets the OPERR bit in the floating-point status register exception byte.
DESTINATION
processed by the normal instruction termination procedure to round it as
required. Thus, an overflow and/or inexact result may occur if the rounding
precision has been changed to a smaller size since the FPn value was
loaded.
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
FPn x INT(2Source)
FSCALE. < fmt > < ea > ,FPn
FSCALE.X FPm,FPn
Format = (Byte, Word, Long, Single, Double, Extended, Packed)
+
+ 0.0
+ inf
Scale Exponent
In Range
(MC6888X, M68040FPSP)
2
14
Scale Exponent
, an overflow or underflow always results.
– 0.0 + 0.0
– inf + inf
FPn
– +
SOURCE
Zero
FPn
2
1
– 0.0
– inf
– +
Floating Point Instructions
Infinity
FSCALE
NAN
NAN
NAN
3
3
3
Source
, but is
–
5-107