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BCD Calculation Instructions Section 5-21
5-21 BCD Calculation Instructions
5-21-1 SET CARRY – STC(40)
When the execution condition is OFF, STC(40) is not executed. When the exe-
cution condition is ON, STC(40) turns ON CY (SR 25504).
Note Refer to Appendix B Error and Arithmetic Flag Operation for a table listing the
instructions that affect CY.
5-21-2 CLEAR CARRY – CLC(41)
When the execution condition is OFF, CLC(41) is not executed. When the exe-
cution condition is ON, CLC(41) turns OFF CY (SR 25504).
CLEAR CARRY is used to reset (turn OFF) CY (SR 25504) to “0.”
Note Refer to Appendix B Error and Arithmetic Flag Operation for a table listing the
instructions that affect CY.
5-21-3 BCD ADD – ADD(30)
Limitations DM 6144 to DM 6655 cannot be used for R.
Description When the execution condition is OFF, ADD(30) is not executed. When the
execution condition is ON, ADD(30) adds the contents of Au, Ad, and CY, and
places the result in R. CY will be set if the result is greater than 9999.
Flags ER: Au and/or Ad is not BCD.
Indirectly addressed EM/DM word is non-existent.
(Content of *EM/*DM word is not BCD, or the EM/DM area boundary
has been exceeded.)
CY: ON when there is a carry in the result.
EQ: ON when the result is 0.
Ladder Symbols
STC(40) @STC(40)
Ladder Symbols
CLC(41) @CLC(41)
Au: Augend word (BCD)
IR, SR, AR, DM, EM, HR, TIM/CNT, LR, #
Ad: Addend word (BCD)
IR, SR, AR, DM, EM, HR, TIM/CNT, LR, #
Ladder Symbols
Operand Data Areas
R: Result word
IR, SR, AR, DM, EM, HR, LR
ADD(30)
Au
Ad
R
@ADD(30)
Au
Ad
R
Au + Ad + CY CY R
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