12 cmps compare two strings – Texas Instruments MSP50C6xx User Manual
Page 180
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.