Filter
Top Products
Individual Instruction Descriptions
4-96
4.14.15 ENDLOOP End Loop
Syntax
[label] name #
Clock,
clk
Word,
w
With RPT,
clk
Class
ENDLOOP [
n
] 1 1 N/R 9d
Execution If (R4 ≥ 0)
decrement R4 by
n
(1 or 2)
PC ⇐ first address after BEGLOOP
else
NOP
PC ⇐ PC + 1
Flags Affected None
Opcode
Instructions 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
ENDLOOP
n
1 1 1 1 1 1 1 1 0 0 0 0 1
0
0 0
n
Description This instruction marks the end of a loop defined by BEGLOOP. If register R4
is not negative, R4 is decremented by
n
and the loop is executed again
beginning with the first instruction after the BEGLOOP. If R4 is negative, a
NOP instruction is executed and program exits the loop. Interrupts (queued by
BEGLOOP) are processed according to their priority. This instruction results
in an overhead of one instruction cycle per loop cycle compared to two
instruction cycle if branching is used. If ENDLOOP is used without any
argument, it assumes
n
=1.
See Also BEGLOOP, INTE
Example 4.14.15.1 See Example 4.14.7.1 in BEGLOOP.