X-Hacker.org- TMS320C2x DSP - syntax direct [<label>] sqrs <dma>

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SYNTAX      DIRECT   [<LABEL>] SQRS <dma>
            INDIRECT [<LABEL>] SQRS {ind}[,<next ARP>]

OPERANDS    0 . dma . 127; 0 . next ARP . 7.

EXECUTION   (PC) + 1 . PC
            (ACC) - (shifted P register) . ACC
            (dma) . T register
            (dma) * (dma) . P register
            Affects OV; affected by PM and OVM.
            Affects C (TMS320C25).

DESCRIPTION The contents of the P register, shifted as defined by the PM
            status bits, are subtracted from the accumulator. The
            addressed data memory value is then loaded into the T
            register, squared, and stored in the P register.

WORDS       1

ENCODING    15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
            +-----------------------------------------------+
            |0  1  0  1  1  0  1  0| 0| data memory address | DIRECT
            +-----------------------------------------------+

            15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
            +-----------------------------------------------+
            |0  1  0  1  1  0  1  0| 1| see indirect fields | INDIRECT
            +-----------------------------------------------+

CYCLES

            +------------------------------------------------+
            |    Cycle Timings for a Single Instruction      |
            |------------------------------------------------|
            | PI/DI | PI/DE | PE/DI | PE/DE  | PR/DI | PR/DE |
            |-------+-------+-------+--------+-------+-------|
      '20   |   1   |  2+d  |  1+p  | 2+d+p  |   -   |   -   |
            |-------+-------+-------+--------+-------+-------|
     'C25   |   1   |  2+d  |  1+p  | 2+d+p  |   1   |  2+d  |
            |------------------------------------------------|
            |    Cycle Timings for a Repeat Instruction      |
            |------------------------------------------------|
      '20   |   n   | 2n+nd |  n+p  | 2n+nd+p|   -   |   -   |
            |-------+-------+-------+--------+-------+-------|
     'C25   |   n   | 1+n+nd|  n+p  |1+n+nd+p|   n   |1+n+nd |
            +------------------------------------------------+



EXAMPLE     SQRS  DAT9        (DP = 6, PM = 0)
            or
            SQRS  *           If current auxiliary register contains 777.

                 BEFORE              AFTER

            dm777    >8        dm777    >8
                T >1124            T    >8
                P  >190            P   >40
            ACC X >1450        ACC 0 >12C0
                C                  C

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