MC68EC000EI20 Freescale Semiconductor, MC68EC000EI20 Datasheet - Page 381
MC68EC000EI20
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
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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
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