236
On
the N
th
cycle, the previous value of S is written to last word in the range D+2 to
D+N+1.
The average value of the
previous values stored in D+2 to D+N+1 is cal
-
culated
and written to D, bit 15 of D+1 is turned ON, and the previous value point
-
er
(the first 2 digits of D+1) is reset to zero. Each time that A
VG(––) is executed,
the
previous value of S overwrites the content of the word indicated by the point
-
er
and the new average value is calculated and written to D. The pointer will be
reset again after reaching N–1.
The following diagram shows the function of words D to D+N+1.
D Average
value (after N or more cycles)
D+1
Previous value pointer and cycle indicator
D+2
Previous value #1
D+3
Previous value #2
D+N+1
Previous value #N
The
function of bits in D+1 are shown in the following diagram and explained in
more detail below.
15 14 08 07 00
Previous
value pointer
(2-digit hexadecimal from 0 to N–1.)
D+1:
Not used. Set to zero.
Cycle indicator
0 (OFF): cycles since execution of AVG(––) < N.
1 (ON): cycles since execution of AVG(––) ≥ N.
Previous Value Pointer The
previous value pointer indicates the location where the most
recent value of
S
was stored relative to D+2, i.e., a pointer value of 0 indicates D+2, a value of 1
indicates D+3, etc.
Cycle Indicator The
cycle indicator is turned ON after A
VG(––) has
been executed N times. At
this
point, D will contain the average value of the contents of
words D+2 through
D+N+1.
The average value is 4-digit hexadecimal and is rounded of
f to the near
-
est integer value.
Flags ER: Indirectly
addressed
DM word is non-existent. (Content of
:
DM word is
not BCD, or the DM area boundary has been exceeded.)
One or more operands have been set incorrectly.
Special Math Instructions Section 5-21
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