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TMS320F Datasheet(PDF) 78 Page - Texas Instruments |
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TMS320F Datasheet(HTML) 78 Page - Texas Instruments |
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78 / 389 page  Repeating a Single Instruction 5-14 5.5 Repeating a Single Instruction The ’C24x repeat instruction (RPT) allows the execution of a single instruction N + 1 times, where N is specified as an operand of the RPT instruction. When RPT is executed, the repeat counter (RPTC) is loaded with N. RPTC is then decremented every time the repeated instruction is executed, until RPTC equals 0. RPTC can be used as a 16-bit counter when the count value is read from a data-memory location; if the count value is specified as a constant oper- and, it is in an 8-bit counter. The repeat feature is useful with instructions such as NORM (normalize con- tents of accumulator), MACD (multiply and accumulate with data move), and SUBC (conditional subtract). When instructions are repeated, the address and data buses for program memory are free to fetch a second operand in parallel with the address and data buses for data memory. This allows instructions such as MACD and BLPD to effectively execute in a single cycle when repeated. |
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