section 7 - Index of

DO Start Hardware Loop DOInstruction Format:DO S, exprOpcode:23 20 19 16 15 8 7 0o 0 0 01 0 1 1 o 11 1 D DID D D DID 0 0 01 0 o 0 0ABSOLUTE ADDRESS EXTENSIONInstruction Fields:S=6-bit Source operand = 000000,expr=16-bit Absolute Address in 24-bit extension wordSSource D D D D D D S/L Source D D D D D DXO 0 0 0 1 0 0 no SR 1 1 1 0 0 1X1 0 0 0 1 0 1 no OMR 1 1 1 0 1 0YO 0 0 0 1 1 0 no SP* 1 1 1 0 1 1Y1 0 0 0 1 1 1 no SSL** 1 1 1 1 0 1AO 0 0 1 0 0 0 no LA 1 1 1 1 1 0BO 0 0 1 0 0 1 no LC 1 1 1 1 1 1A2 0 0 1 0 1 0 no RO-R7 0 1 0 r r rB2 0 0 1 1 0 0 no NO-N7 0 1 1 n n nA1 0 0 1 1 0 1 no MO-M7 1 0 0 m m mA 0 0 1 1 1 0 yes [see Notes on page A-97]B 0 0 1 1 1 1 yes [see Notes on page A-97]where rrr=Rn registerwhere nnn=Nn registerwhere mmm=Mn register-*For DO SP, expr The actual value that will be loaded into the loop counter (LC) isthe value of the stack pointer (SP) before the execution of theDO instruction, incremented by 1.Thus, if SP=3, the execution of the DO SP,expr instruction will load the loopcounter (LC) with the value LC=4.**For DO SSL, expr The loop counter (LC) will be loaded with its previous valuewhich was saved on the stack by the DO instruction itself.