MC68EC000EI20 Freescale Semiconductor, MC68EC000EI20 Datasheet - Page 406

• 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: -

Floating Point Instructions
FREM
Operation:
Assembler
Syntax:
Attributes:
Description: Converts the source operand to extended precision (if necessary) and
Operation Table:
5-104
calculates the modulo remainder of the number in the destination floating-point data
register, using the source operand as the modulus. Stores the result in the destination
floating-point data register and stores the sign and seven least significant bits of the
quotient in the floating-point status register quotient byte (the quotient is the result of
FPn
where N = INT (FPn
The FREM function is not defined for a source operand equal to zero or for a destina-
tion operand equal to infinity. Note that this function is not the same as the FMOD
instruction, which uses the round-to-zero mode and thus returns a remainder that is dif-
ferent from the remainder required by the IEEE Specification for Binary Floating-Point
Arithmetic .
NOTES:
1. If the source operand is a NAN, refer to 1.6.5 Not-A-Numbers for more information.
2. Sets the OPERR bit in the floating-point status register exception byte.
3. Returns the value of FPn before the operation. However, the result is
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.
In Range
Infinity
Source). The IEEE remainder function is defined as:
Zero
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
IEEE Remainder of (FPn
FREM. < fmt > < ea > ,FPn
FREM.X FPm,FPn
Format = (Byte, Word, Long, Single, Double, Extended, Packed)
+
+
–
–
+
–
+
Source) in the round-to-nearest mode.
IEEE Remainder
In Range
(MC6888X, M68040FPSP)
NAN
+ 0.0
– 0.0
IEEE Remainder
FPn – (Source x N)
2
– +
Source)
SOURCE
NAN
NAN
NAN
Zero#
2
2
2
1
FPn
– +
NAN†
Infinity
FPn
+ 0.0
– 0.0
2
FREM
2
MOTOROLA
–