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Individual Instruction Descriptions
4-94
4.14.12 CMPS Compare Two Strings
Syntax
[label] name src, src1 Clock, clk Word, w With RPT, clk Class
CMPS An, {adrs} Table 4–46 Table 4–46 1b
CMPS An[~], pma16 n
S
+4 2 N/R 2b
CMPS
CMPS
An, An~
An~, An
n
S
+3 1 n
R
+3 3
Execution status flags set by (src – src1) string
PC ⇐ PC + w
Flags Affected src is An:OF, SF, ZF, CF are set accordingly
src1 is {adrs}: TAG bit is set accordingly
Opcode
Instructions 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
CMPB An, {adrs}
0 1 0 1 1 0 1 An adrs
x dma16 (for direct) or offset16 (long relative) [see section 4.13]
CMPS An[~], pma16
1 1 1 0 0 1 1 An 0 1 1 0 0 1 A~ 0
x pma16
CMPS An, An~ 1 1 1 0 0 1 1 An 1 0 0 0 0 0 0 0
CMPS An~, An 1 1 1 0 0 1 1 An 1 0 0 0 0 0 1 0
Description Subtract src1 string from src string and only modify the status flags. Content
of accumulators are not changed.
See Also CMPB, CMP, Jcc, Ccc
Example 4.14.12.1 CMPS A0, *R0
Compare string at data memory location pointed by R0 to A0 and change the STAT flags accordingly.
Example 4.14.12.2 CMPS A1~, 0x1400
Compare string at program memory location 0x1400 to A1~ and change the STAT flags accordingly.
Example 4.14.12.3 CMPS A2, A2~
Compare accumulator string A2 to accumulator string A2~ and change the STAT flags accordingly.