701
Table Data Processing Instructions
Section 3-17
LIFO(634)
Reads the last (most recent) word of data that was stored in the stack. Decre-
ments the pointer by one and reads the data at this address (the most recent
data stored in the stack). The read data will not be cleared.
SREAD(639)
Reads the data from the specified data element in the stack. The offset value
indicates the location of the desired word (the number of words before the cur-
rent pointer position).
A
B
A
B
Data region
Pointer
Stack
A is the last word
stored in the stack.
Pointer
Stack
Data region
Decrements the pointer by one
and reads content of A.
A
:
A
B
C
:
A
B
C
Data region
Pointer
Pointer
(Unchanged)
Last word of
data in stack
Stack
Data region
Data in pointer position - n
(n=3 in this example.)
Stack
Pointer to last
word in stack
Pointer
Reads data from pointer
position - n.
(n=3 in this example.)
-n
(n=3)
Summary of Contents for SYSMAC CS1D-CPU**
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Page 185: ...146 List of Instructions by Function Code Section 2 4...
Page 1389: ...1350 CJ series Instruction Execution Times and Number of Steps Section 4 2...
Page 1390: ...1351 Appendix A ASCII Code Table ASCII SP Four leftmost bits Four rightmost bits...
Page 1391: ...1352 ASCII Code Table Appendix A...