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2 Instructions
CP1E CPU Unit Instructions Reference Manual(W483)

Symbol Math Instructions

2

–BC/–BCL

–BC/–BCL
Applicable Program Areas
Operands
Operand Specifications
Flags

Instruction Mnemonic Variations Function

code Function

BCD SUBTRACT WITH

CARRY –BC @–BC 416 Subtracts 4-digit (single-word) BCD data and/or

constants with the Carry Flag (CY).

DOUBLE BCD SUBTRACT

WITH CARRY –BCL @–BCL 417 Subtracts 8-digit (double-word) BCD data and/or

constants with the Carry Flag (CY).

Symbol
–BC –BCL
Area Step program areas Subroutines Interrupt tasks
Usage OK OK OK
Operand Description Data type Size
–BC –BCL –BC –BCL
Mi –BC: Minuend word
–BCL:First minuend word WORD DWORD 1 2
Su –BC: Subtrahend word
–BCL:First subtrahend word WORD DWORD 1 2
R–BC: Result word
–BCL:First result word WORD DWORD 1 2
Area Word addresses Indirect DM addresses Constants CF Pulse bits TR bits
CIO WR HR AR T C DM @DM *DM
Mi, Su OK OK OK OK OK OK OK OK OK OK --- --- ---
R---
Name Label Operation
–BC –BCL
Error Flag P_ER ON when Mi is not BCD.
ON when Su is not BCD.
OFF in all other cases.
ON when Mi and/or Mi +1 are not BCD.
ON when Su and/or Su +1 are not BCD.
OFF in all other cases.
Equals Flag P_EQ ON when the result is 0.
OFF in all other cases.
ON when the result is 0.
OFF in all other cases.
Carry Flag P_CY ON when the subtraction results in a borrow.
OFF in all other cases.
ON when the subtraction results in a borrow.
OFF in all other cases.
–BC(416)
R
Mi
Su
Mi: Minuend word
Su: Subtrahend word
R: Result word
–BCL(417)
R
Mi
Su
Mi: 1st minuend word
Su: 1st subtrahend word
R: 1st result word