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TMS320F Datasheet(PDF) 259 Page - Texas Instruments |
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TMS320F Datasheet(HTML) 259 Page - Texas Instruments |
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259 / 389 page  Subtract PREG From Accumulator SPAC 7-159 Assembly Language Instructions Syntax SPAC Operands None Opcode 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 0 1 0 0 0 0 0 0 1 1 1 1 1 0 1 Execution Increment PC, then ... (ACC) – shifted (PREG) → ACC Status Bits Affected by Affects PM and OVM C and OV This instruction is not affected by SXM. Description The content of PREG, shifted as defined by the PM status bits, is subtracted from the content of the accumulator. The result is stored in the accumulator. SPAC is not affected by SXM, and the PREG value is always sign extended. The function of the SPAC instruction is a subtask of the LTS, MPYS, and SQRS instructions. Words 1 Cycles for a Single SPAC Instruction ROM DARAM SARAM External 1 1 1 1+p Cycles for a Repeat (RPT) Execution of an SPAC Instruction ROM DARAM SARAM External n n n n+p Example SPAC ;(PM = 0) Before Instruction After Instruction PREG 10000000h PREG 10000000h ACC X 70000000h ACC 1 60000000h CC Cycles |
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