MC68EC000EI16 Freescale Semiconductor, MC68EC000EI16 Datasheet - Page 387

• 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: -

FMOVEM
Operation:
Assembler
Syntax:
Attributes:
Description:Moves one or more extended-precision numbers to or from a list of floating-
MOTOROLA
point data registers. No conversion or rounding is performed during this operation, and
the floating-point status register is not affected by the instruction. For the MC68881, this
instruction does not cause pending exceptions (other than protocol violations) to be
reported. Furthermore, a write to the floating- point control register exception enable
byte or the floating-point status register exception status byte connot generate a new
exception, despite the value written.
Any combination of the eight floating-point data registers can be transferred, with the
selected registers specified by a user- supplied mask. This mask is an 8-bit number,
where each bit corresponds to one register; if a bit is set in the mask, that register is
moved. The register select mask may be specified as a static value contained in the
instruction or a dynamic value in the least significant eight bits of an integer data reg-
ister (the remaining bits of the register are ignored).
FMOVEM allows three types of addressing modes: the control modes, the predecre-
ment mode, or the postincrement mode. If the effective address is one of the control
addressing modes, the registers are transferred between the processor and memory
starting at the specified address and up through higher addresses. The order of the
transfer is from FP0 – FP7.
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
Register List
Source
FMOVEM.X < list > , < ea >
FMOVEM.X Dn, < ea >
FMOVEM.X < ea > , < list > FMOVEM.X < ea > ,Dn
Format = (Extended)
Move Multiple Floating-Point
Register List
(MC6888X, MC68040)
Data Registers
Destination
Floating Point Instructions
FMOVEM
5-85