10 cmp compare two words – Texas Instruments MSP50C6xx User Manual
Page 177
Individual Instruction Descriptions
4-91
Assembly Language Instructions
4.14.10
CMP
Compare Two Words
[label]
name
src, src1 [, mod]
Clock, clk
Word, w
With RPT, clk
Class
CMP
An, {adrs}
Table 4–46
Table 4–46
1b
CMP
An[~], imm16 [, next A]
2
2
N/R
2b
CMP
CMP
An, An~ [, next A]
An~, An [, next A]
1
1
n
R
+3
3
CMP
†
Rx, imm16
2
2
N/R
4c
CMP
†
Rx, R5
1
1
n
R
+3
4d
† Does not modify An status
Execution
[premodify AP if mod specified]
STAT flags set by src – src1 operation
PC = PC + w
Flags Affected
src is An:
OF, SF, ZF, CF are set accordingly
src is Rx:
RCF, RZF are set accordingly
src 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
CMP An, {adrs}
0
1
0
1
1
0
0
An
adrs
x
dma16 (for direct) or offset16 (long relative) [see section 4.13]
CMP An[~], imm16 [, next A]
1
1
1
0
0
next A
An
0
1
1
0
0
1
A~
~A
x
imm16
CMP An, An~ [, next A]
1
1
1
0
0
next A
An
1
0
0
0
0
0
0
0
CMP An~, An [, next A]
1
1
1
0
0
next A
An
1
0
0
0
0
0
1
0
CMP Rx, imm16
1
1
1
1
1
1
1
0
0
0
1
1
Rx
0
0
x
imm16
CMP Rx, R5
1
1
1
1
1
1
1
0
0
1
1
1
Rx
0
0
Description
Subtract value of src1 from src (i.e., src–src1) and only modify the status flag.
Premodification of accumulator pointer is allowed with some operand types.
See Also
CMPB, CMPS, Jcc, Ccc
Example 4.14.10.1
CMP A0, *R0
Compare value at accumulator A0 and the content of data memory location pointed by R0 and change
the STAT flags accordingly.
Example 4.14.10.2
CMP A0~, 0x1400, – –A
Predecrement accumulator pointer AP0. Compare value at accumulator A0~ to immediate value at
0x1400 and change the STAT flags accordingly.