535
Double-precision Floating-point Instructions Section 3-15
Operand Specifications
Description DBLL(844) converts the 32-bit signed binary value in S+1 and S to double-
precision (64-bit) floating-point data (IEEE754-format) and places the result in
words D to D+3. A single 0 is added after the decimal point in the floating-
point result.
Signed binary data within the range of –2,147,483,648 to 2,147,483,647 can
be specified for S+1 and S. The floating point value has 24 significant binary
digits (bits). The result will not be exact if a number greater than 16,777,215
(the maximum value that can be expressed in 24-bits) is converted by
DBLL(844).
Example Conversions:
A signed binary value of 16,777,215 is converted to 16,777,215.0.
A signed binary value of –16,777,215 is converted to –15,777,215.0.
Flags
Precautions The result will not be exact if a number with an absolute value greater than
16,777,215 (the maximum value that can be expressed in 24-bits) is con-
verted.
Area S D
CIO Area CIO 0 to CIO 6142 CIO 0 to CIO 6140
Work Area W0 to W510 W0 to W508
Holding Bit Area H0 to H510 H0 to H508
Auxiliary Bit Area A0 to A958 A448 to A956
Timer Area T0000 to T4094 T0000 to T4092
Counter Area C0000 to C4094 C0000 to C4092
DM Area D0 to D32766 D0 to D32764
Indirect DM addresses
in binary
@ D0 to @ D32767
Indirect DM addresses
in BCD
*D0 to *D32767
Constants #00000000 to #FFFFFFFF
(binary)
---
Data Registers ---
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
S+1
D+1
S
DD+2D+3
Signed binary data (32 bits)
Floating-point data (64 bits)
Name Label Operation
Error Flag ER OFF
Equals Flag = ON if both the exponent and mantissa of the result are 0.
OFF in all other cases.
Negative Flag N ON if the result is negative.
OFF in all other cases.
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