Double Bcd Multiply: Mull(076) - Omron SYSMAC CV Series Operation Manual

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BCD Calculation Instructions

5-18-9 DOUBLE BCD MULTIPLY: MULL(076)

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The following example works much like that for single-word subtraction. In this

example, however, the 8-digit number in CIO 0121 and CIO 0120 is subtracted

from the 8-digit number in CIO 0201 and CIO 0200 when CIO 000003 is ON, and

the result is output to D00101 and D00100. If the result is negative, the comple-

ment is then subtracted from 0 to yield the actual number and CIO bit 002100 (a

self-holding bit) is turned ON to indicate the negative result.

When the execution condition is OFF, MULL(076) is not executed. When the

execution condition is ON, MULL(076) multiplies the 8-digit content of Md and

Md+1 by the content of Mr and Mr+1, and places the result in R to R+3.

Note With version-2 CVM1 CPUs, mathematics instructions can use symbols. The

instructions corresponding to MUL(072) and MULL(076) are

Md, Md+1, Mr, and Mr+1 must be BCD.

Turned ON to

indicate nega-

tive result.

Operand Data Areas

multiplicand wd CIO, G, A, T, C, #, DM

multiplier word CIO, G, A, T, C, #, DM

CIO, G, A, DM

Section 5-18

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