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Individual Instruction Descriptions
4-91Assembly 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.