405
Conversion Instructions Section 3-11
Operand Specifications
Description DMPX(077) can perform 16-to-4 bit or 256-to-8 bit conversions. Set the left-
most digit of C to 0 to specify 16-to-4 bit conversion and set it to 1 to specify
256-to-8 bit conversion.
16-to-4 bit Conversion
When the fourth (leftmost) digit of C is 0, DMPX(077) finds the locations of the
leftmost or rightmost ON bits in up to 4 source words and writes these loca-
tions to R beginning with the specified digit. (Set the third digit of C to 0 to find
the leftmost ON bits or 1 to find the rightmost ON bits.)
When two or more digits are being converted, DMPX(077) will write the values
to the digits in R from right to left and will wrap around to the rightmost digit
after the leftmost digit, if necessary.
The following diagram shows some example values for C and the 16-to-4 bit
conversions that they produce.
Area S R C
CIO Area CIO 0 to CIO 6143
Work Area W0 to W511
Holding Bit Area H0 to H511
Auxiliary Bit Area A0 to A959 A448 to A959 A0 to A959
Timer Area T0000 to T4095
Counter Area C0000 to C4095
DM Area D0 to D32767
Indirect DM addresses
in binary
@ D0 to @ D32767
Indirect DM addresses
in BCD
*D0 to *D32767
Constants --- --- Specified values
only
Data Registers --- DR0 to DR15
Index Registers ---
Indirect addressing
using Index Registers
,IR0 to ,IR15
–2048 to +2047 ,IR0 to –2048 to +2047 ,IR15
DR0 to DR15, IR0 to IR15
,IR0+(++) to ,IR15+(++)
,–(– –)IR0 to, –(– –)IR15
R
m
C
Leftmost bit
n=2 (Start with digit 2.)
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