MC68EC000EI16 Freescale Semiconductor, MC68EC000EI16 Datasheet - Page 381

• 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
MOTOROLA
Source Register field—Specifies the source floating-point data register.
The format of this field for a dynamic k-factor is:
where "rrr" is the number of the main processor data register that contains the k-factor
value.
The following table gives several examples of how the k-factor value affects the format
of the decimal string that is produced by the floating-point coprocessor. The format of
the string that is generated is independent of the source of the k-factor (static or
dynamic).
k-Factor field—If the destination format is packed decimal, used to specify the format
of the decimal string. For any other destination format, this field should be set to
all zeros. For a static k-factor, this field is encoded with a twos-complement
integer where the value defines the format as follows:
– 64 to 0—Indicates the number of significant digits to the right of the decimal
point (FORTRAN "F" format).
+ 1 to + 17—Indicates the number of significant digits in the mantissa (FOR-
TRAN "E" format).
+ 18 to + 63—Sets the OPERR bit in the floating-point status register exception
byte and treated as + 17.
M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL
k- Factor Source Operand Value
Move Floating-Point Data Register
– 5
– 3
– 1
+ 1
+ 3
+ 5
0
+ 12345.678765
+ 12345.678765
+ 12345.678765
+ 12345.678765
+ 12345.678765
+ 12345.678765
+ 12345.678765
(MC6888X, MC68040)
r r r 0 0 0 0
+ 1.234567877E + 4
+ 1.2345679E + 4
+ 1.23457E + 4
+ 1.2346E + 4
+ 1.E + 4
+ 1.23E + 4
+ 1.2346E + 4
Destination String
Floating Point Instructions
FMOVE
5-79