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unknown instructions in SS framework


We using Sigmastudio 4.5 for sharc and crosscore 2.9.4

in the main() routine of the sigma studio framework examples we found the follow code

/* Force SLOWLOOP */
asm("ustat1 = 0x42000081;");  /* Default value of MODE2 |ed with SLOWLOOP bit(7) */
asm("mode2 = ustat1;");

what means these instructions and where can we find more information in the datasheets?