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New Instructions Introduced. BANZ. NOP. RPT. RPTZ. Overview of Tutorial. A commonly encountered task within a program is to execute an operation multiple times. Users of high level languages will be familiar with the way this is implemented using the FOR, WHILE and REPEAT-UNTIL (DO-WHILE) constructions.
It causes the next instruction to be repeated 16 times. RPT 15 uses direct addressing. The number of times the next instruction repeats is determined by a value stored in memory. For instructions using immediate operands for which there is no ambiguity, # is accepted by the assembler. For example, RPTZ A, #15 and RPTZ
The RPTZ instruction also clears the accumulator and the product register to initialize the multiply/accumulate operation. The MACD and MADD instructions, when repeated, support filter constructs (weighted running averages) so that as the sum-of-products is executed, the sample data is shifted in memory to make room for
24 Jan 2005 rptz. A,(FIR_len-1). 13 mac. *AR2+0%,*AR3+0%,A. Anything following a ";" is considered a comment. In this case, the comments indicate the contents of the auxiliary registers, the BK register, and the address registers before the execution of the first instruction, stl. The line FIR_len .set 3 defines the name
1,ALEQ. ; test for accumulator a? 0 mac. *ar1+,*ar2+,a. ; perform MAC only if a? 0 add. #12,a,a. ; always perform add. ? Repeat single instruction or block. 4Overhead: 1 cycle for RPT/RPTZ and 4 cycles for RPTB. 4Hardware loop counters count down rptz a,#39. ; zero accumulator a. ; repeat next instruction 40 times mac.
The plus sign for the coefficient is implied. The pointer to the address in the coefficient array is stored in a register in the program counter (PC) controller. Accessing the coefficient array automatically increments the pointer, so no symbol is used. The. RPTZ instruction zeroes accumulator A and repeats the next instruction 15
29 May 2001 Additionally, record the value of the memory contents after all three instructions have been "executed" in the blank data memory table provided in . A AR2 AR3 00 0000 8000h 1000h 1004h at start of code after stl instruction after rptz instruction after first mac instruction after second mac instruction after third
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