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Individual Instruction Descriptions
4-155
Assembly Language Instructions
4.14.60 RPT Repeat Next Instruction
Syntax
[label] name src
Clock,
clk
Word,
w
With RPT,
clk
Class
RPT {
adrs
}
8
Table 4–46 N/R 5
RPT
imm8
1 1 N/R 9b
Execution IF RPT {
adrs
}
8
load
src
to repeat counter.
ELSE
load
imm8
to repeat counter.
(
mask interrupt
)
repeat next instruction (repeat counter value + 2) times.
PC ⇐ PC +
w
(next instruction)+1
Flags Affected None
Opcode
Instructions 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RPT {
adrs
}
8
1 1 0 1 1 1 1 1 0
adrs
RPT
imm8
1 1 1 1 1 1 0 0 0
imm8
Description Loads
src
value to repeat counter. Execute next instruction
src
value + 2 times.
Interrupts are queued during RPT instruction. Queued interrupts are serviced
after execution completes.
Syntax Description
RPT {
adrs
}
8
Load data memory byte to repeat counter, repeat next instruction
RPT
imm8
Load immediate byte to repeat counter, repeat next instruction
See Also BEGLOOP, ENDLOOP
Example 4.14.60.1 RPT *0x0100 * 2
MOV *R1++, A0, ++A
Loads the repeat counter with value stored in word data memory location 0x0100. Only 8 bits of data
from this location are used. The next instruction stores content of A0 to data memory address pointed
by R1. Since R1 post increments and A0 preincrements in this instruction, the overall effect of executing
this instruction with RPT is to store accumulator contents to consecutive data memory locations. See
MOV instruction for detail of various syntax of MOV instruction.
Example 4.14.60.2 RPT 200
NOP
Repeat the NOP instruction 202 times (provided the next instruction is repeatable). This causes 203
instruction cycle delay (including 1 cycle for the RPT instruction).