Texas Instruments TMS320C67X/C67X+ DSP - Manual (Page 313)

Subtract Using Byte Addressing Mode SUBAB
3-253 Instruction Set SPRU733
Subtract Using Byte Addressing Mode SUBAB
Syntax SUBAB (.unit) src2, src1, dst
.unit = .D1 or .D2
Compatibility C62x, C64x, C67x, and C67x+ CPU
Opcode
31 29 28 27 23 22 18 17 13 12 7 6 5 4 3 2 1 0
creg z dst src2 src1 op 1 0 0 0 0 s p
3 1 5 5 5 6 1 1
Opcode map field used... For operand type... Unit Opfield
src2
src1
dst sint
sint
sint .D1, .D2 11 0001
src2
src1
dst sint
ucst5
sint .D1, .D2 11 0011
Description src1 is subtracted from src2 using the byte addressing mode specified for src2.
The subtraction defaults to linear mode. However, if src2 is one of A4−A7 or
B4−B7, the mode can be changed to circular mode by writing the appropriate
value to the AMR (see section 2.7.3, page 2-10). The result is placed in dst.
Execution if (cond) src2 −a src1 → dst
else nop
Pipeline
Stage
E1
Read src1, src2
Written dst
Unit in use .D
Instruction Type Single-cycle
Delay Slots 0
See Also SUB, SUBAH, SUBAW
Pipeline