Click above to get retro games delivered to your door ever month!

SYNTAX      DIRECT    [<label>] ADDH <dma>
            INDIRECT  [<label>] ADDH {ind}[,<next ARP>]

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

EXECUTION   (PC) + 1 . PC
            (ACC) + [(dma) * 2 ^16] . ACC
            Affects OV; affected by OVM.
            Affects C (TMS320C25).
            Low-order bits of the ACC not affected.

DESCRIPTION The contents of the addressed data memory location are added
            to the upper half of the accumulator (bits 31 through 16).
            Low-order bits are unaffected by the ADDH. The carry bit (C)
            on the TMS320C25 is set if the result of the addition
            generates a carry; otherwise, C is unaffected. The carry bit
            can only be set, not reset, by the ADDH instruction.

            The ADDH instruction may be used in performing 32-bit
            arithmetic.

WORDS       1

ENCODING    15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
            +-----------------------------------------------+
            |0  1  0  0  1  0  0  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  0  1  0  0  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     ADDH  DAT5        (DP = 8)
            or
            ADDH  *           If the current register contains 1029.

                BEFORE              AFTER

           dm1029   >4      dm1029     >4
            ACC 1  >13       ACC 1 >40013
                C                C