4
FTENTOX
10X
FTENTOX
Instruction Fields:
Coprocessor ID Field -- Specifies which coprocessor in the system is to execute this
instruction. Freescale assemblers default to ID = 1 for the FPCP.
Effective Address Field -- Determines the addressing mode for external operands.
If R/M =0, this field is unused, and should be all zeros.
If R/M = 1, this field is encoded with an M68000 addressing mode as shown:
Addressing Mode Mode
Dn* .000
An
(An) 010
(An) + 011
-(An) 100
(d16,An) 101
(d8,An,Xn) 110
(bd,An,Xn) 110
([bd,An,XnJ,od) 110
([bd,AnJ,Xn,od) : 110
Register
reg. number:Dn
reg. number:An
reg. number:An
reg. number:An
reg. number:An
reg. number:An
reg. number:An
reg. number:An
reg. number:An
*Only if <fmt> is Byte, Word, Long, or Single.
Addressing Mode
(xxxl.W
(xxx}.L
#<data>
(d16,PC)
{ds,PC,Xn)
(bd,PC,Xn}
{[bd,PC,Xn],od)
([bd,PC],Xn,od)
Mode
111
111
111
111
111
111
l
111
111
1
Register
000
001
100
010
011
011
011
011
R/M Field m Specifies the source operand address mode.
0 m The operation is register to register.
1 ~ The operation is <ea> to register.
Source Specifier Field ~ Specifies the source register or data format.
If R/M =0, specifies the source floating-point data register, FPm.
If R/M = 1, specifies the source data format:
000 L Long Word Integer
001 S Single Precision Real
010 X Extended Precision Real
011 P Packed Decimal Real
100 W Word Integer
101 D Double Precision Real
110 B Byte Integer
Destination Register Field ~ Specifies the destination floating-point data register, FPn.
If R/M = 0 and the source and destination fields are equal, the input operand is taken
from the specified floating-point data register, and the result is written into the same
register. If the single register syntax is used, Freescale assemblers set the source
and destination fields to the same value.
FREESCALE
4-118
MC68881/MC68882 USER'S MANUAL
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