Chapter 4 CPU Specifications
XBC E-Type Main Unit 4-17 Ver. 1
2. Bit device
Like the expression of word data, the bit device is expressed with its lowest digit taken out, using the data of
(Specified device number) and (Specified device number + 1) as double word data.
4.6.6 Real data (REAL, LREAL)
Real data is 32bit/64bit floating decimal point data. 32bit floating decimal point data is called Single Real and
64bit floating decimal point data is called Double Real.
Expression is available only in decimal format (decimal point displayed). And both word device and bit device
are available. 4 basic operations: convert, compare, and trigonometrical function instructions are supported.
Single Real
Double Real
exponent
fraction
b31 b30 b23 b22 b
0
Sign bit
exponent
fraction
b63 b62 b
52 b51 b0
Sign bit
1. Expression range
Single Real number:
- 3.402823466e+038 ~ -1.175494351e-038 or 0 or 1.175494351e-038 ~ 3.402823466e+038
Double Real number:
- 1.7976931348623157e+308 ~ -2.2250738585072014e-308 or 0 or 2.2250738585072014e-308 ~
1.7976931348623157e+308
2. Area unavailable to express (Exists even in negative data)
Single Real number:
Unsigned: 0 ~ 1.40129846e-45
Signed: -1.175494351e-038 ~ 1.175494351e-038
Double Real number:
Unsigned: 0 ~ 4.9406564584124654e-324
Signed: -2.2250738585072014e-308 ~ 2.2250738585072014e-308
2-point data (word) such as P0001, P0002 is the object
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