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Special Math Instructions Section 3-14
Description BCNT(067) counts the total number of bits that are ON in all words between S
and S+(N–1) and places the result in R.
Flags
Precautions An error will occur if N=0000 or the result exceeds FFFF.
Example When CIO 000000 is ON in the following example, BCNT(067) counts the
total number of ON bits in the 10 words from CIO 0100 through CIO 0109 and
writes the result to D00100.
EM Area without bank E00000 to E32767
EM Area with bank En_00000 to En_32767
(n = 0 to C)
Indirect DM/EM
addresses in binary
@ D00000 to @ D32767
@ E00000 to @ E32767
@ En_00000 to @ En_32767
(n = 0 to C)
Indirect DM/EM
addresses in BCD
*D00000 to *D32767
*E00000 to *E32767
*En_00000 to *En_32767
(n = 0 to C)
Constants #0001 to #FFFF
(binary) or &1 to
&65,535
---
Data Registers DR0 to DR15 --- 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
Area N S R
S+(N–1)
R
to
N words
Binary resul
Counts the number
of ON bits.
Name Label Operation
Error Flag ER ON if N is 0000.
ON if result exceeds FFFF.
OFF in all other cases.
Equals Flag = ON if the result is 0000.
OFF in all other cases.
R:D00100
000000
&10
D100
D00100
N
S
R
BCNT
to to
Counts the number
of ON bits (35).
23 hexadecimal
(35 decimal)
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