Publication 1763-RM001C-EN-P - October 2009
Sequencer Instructions
245
This instruction uses the following operands:
•
File - This is the sequencer reference file. Its contents, on an
element-by-element, basis are masked and stored in the destination.
•
Mask - The mask operand contains the mask value. When mask bits
are set to 1, data is allowed to pass through to destination. When
mask bits are reset to 0, the data is masked (does not pass through
to destination). The immediate data ranges for mask are from 0 to
0xFFFF (word) or 0 to 0xFFFFFFFF (long word).
•
Destination - The destination operand is the sequencer location or
file.
•
Control - This is a control file address. The status bits, stack length,
and the position value are stored in this element. The control
element consists of 3 words:
•
Length - The length operand contains the number of steps in the
sequencer file (as well as Mask and/or Destination if they are file
data types). The length of the sequencer can range from 1 to 256.
•
Position - This is the current location or step in the sequencer file
(as well as Mask and/or Destination if they are file data types). It
determines the next location in the stack to be masked and moved
to the destination. Position is a component of the control register.
The position can range from 0 to 255. Position is incremented on
each false-to-true transition.
TIP
If file type is word, then mask and source must be
words. If file type is long word, mask and source
must be long words.
TIP
If mask is direct or indirect, the position selects the
location in the specified file.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Word 0
EN
(1)
(1) EN - Enable Bit is set by a false-to-true rung transition and indicates that the instruction is enabled.
--
DN
(2)
(2) DN - Done Bit is set after the instruction has operated on the last word in the sequencer file. It is reset on the next
false-to-true rung transition after the rung goes false.
--
ER
(3)
(3) ER - Error Bit is set when the controller detects a negative position value, or a negative or zero length value. When the
ER bit is set, the minor error bit (S2:5/2) is also set.
not used
FD
not used
Word 1
Length - contains the index of the last element in the sequencer reference file
Word 2
Position - the current position in the sequence
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