Toshiba T2N - Manual (Page 197)

3. User Data
184 PROSEC T2N
Example 3) Substituting the result of an operation in an index register
–[ RW200 - 30 → I ]–
(Substitute the result of subtracting 30 from RW200 in I)
–[ XW004 ENC (4) J ]–
(Substitute the uppermost ON bit position of XW004 in J (encode))
Although, basically, index registers are processed as single-length
(16 bits), when, for instance, using an index register as the storage
destination for a instruction which becomes double-length as the
result of a multiplication instruction or the like, only the combinations
J•I or K•J are effective. In this case, it becomes J•I by designating I in
the double-length operand position, and J becomes upper while I
becomes lower. In the same, by designating J, it becomes K•J, and K
becomes upper while J becomes lower.
Example)
–[ D1357 * 10
→
J • I ] –
The following are examples of registers in which index modification has
been executed.
When I = 0, expresses RW100
When I = 1, expresses RW101
When I = -1, expresses RW099
When I = 100, expresses RW200
When I = -100, expresses RW000
When J = 0, expresses D0201 · D0200
When J = 1, expresses D0202 · D0201
When J = 2, expresses D0203 · D0202
When J = -1, expresses D0200 · D0199
When J = -2, expresses D0199 · D0198
I
RW100
J
D0201 · D0200
NOTE