MC68EC000EI16 Freescale Semiconductor, MC68EC000EI16 Datasheet - Page 375

• 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: -

FMOVE
Operation:
Assembler
Syntax:
Attributes:
Description: Moves the contents of the source operand to the destination operand.
Memory-to-Register and Register-to-Register Operation: Converts the source operand
MOTOROLA
Although the primary function of this instruction is data movement, it is also considered
an arithmetic instruction since conversions from the source operand format to the
destination operand format are performed implicitly during the move operation. Also,
the source operand is rounded according to the selected rounding precision and mode.
to an extended-precision floating-point number (if necessary) and stores it in the
destination floating-point data register. MOVE will round the result to the precision
selected in the floating-point control register. FSMOVE and FDMOVE will round the
result to single or double precision, respectively, regardless of the rounding precision
selected in the floating-point control register. Depending on the source data format and
the rounding precision, some operations may produce an inexact result. In the following
table, combinations that can produce an inexact result are marked with a dot ( ), but all
other combinations produce an exact result.
Unlike the MOVE instruction, the FMOVE instruction does not support a memory-to-
memory format. For such transfers, it is much faster to utilize the MOVE instruction to
transfer the floating- point data than to use the FMOVE instruction. The FMOVE
instruction only supports memory-to-register, register-to- register, and register-to-
memory operations (in this context, memory may refer to an integer data register if the
data format is byte, word, long, or single). The memory-to-register and register- to-reg-
ister operation uses a command word encoding distinctly different from that used by
the register-to-memory operation; these two operation classes are described sepa-
rately.
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
Source
FMOVE. < fmt > < ea > ,FPn
FMOVE. < fmt > FPm, < ea >
FMOVE.P FPm, < ea > {Dn}
FMOVE.P FPm, < ea > {k}
*FrMOVE. < fmt > < ea > ,FPn
where r is rounding precision, S or D
Format = (Byte, Word, Long, Single, Double, Extended, Packed)
*Supported by MC68040 only
Move Floating-Point Data Register
Destination
(MC6888X, MC68040)
Floating Point Instructions
FMOVE
5-73