Motorola DSP56000, 24-Bit Digital Signal Processor manual Start Hardware Loop

INSTRUCTION DESCRIPTIONS

DO

Start Hardware Loop

DO

Notes: If A or B is specified as the destination operand, the following sequence of events takes place:

1.The S bit is computed according to its definition (See Section A.5)

2.The accumulator value is scaled according to the scaling mode bits S0 and S1 in the status register (SR).

3.If the accumulator extension is in use, the output of the shifter is limited to the maximum positive or negative saturation constant, and the L bit is set.

4.The LS 16 bits of the resulting 24 bit value is loaded into the loop counter (LC). The original contents of A or B are not changed.

Timing: 6+mv oscillator clock cycles

Memory: 2 program words

MOTOROLA INSTRUCTION SET DETAILS A - 97