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6F3B0253
Basic Hardware and Function 149
7. Instructions
FUN 035 +C Addition with carry
Expression
Input −[ A +C B → C ]− Output
Function
When the input is ON, the data of A, B and the carry flag (CF = S050) are added, and the result is
stored in C. If carry is occurred in the operation, the carry flag is set to ON. If the result is greater
than 32767 or smaller than -32768, the output is turned ON.
This instruction is used to perform unsigned addition or double-length addition.
Execution condition
Input Operation Output CF
OFF No execution OFF
−
ON Execution Normal No carry OFF Reset
Carry occurred OFF Set
Overflow / No carry ON Reset
underflow Carry occurred ON Set
Operand
Name Device Register Constant Index
X Y R S T. C. XWYWRWSW T C D I J K
A Augend
√√√√√√√√√√ √ √
B Addend
√√√√√√√√√√ √ √
C Sum
√√√√√√√√√ √
Example
When R013 is ON, the data of double-length registers D0101⋅D0100 and RW21⋅RW20 are
added, and the result is stored in D0201⋅D0200. The RSTC is a instruction to reset the carry
flag before starting the calculation.
If the data of D0101⋅D0100 is 12345678 and RW21⋅RW20 is 54322, the result 12400000 is
stored in D0201⋅D0200.
D0101⋅D0100 12345678
+
D0201⋅D0200 12400000
RW21⋅RW20 54322