section 7 - Index of

TST Test Accumulator TSTOperation:Assembler Syntax:, s-o (parallel move) TST S (parallel move)Description: Compare the specified source accumulator S with zero and set the conditioncodes accordingly. No result is stored although the condition codes are updated.Example:TST A #$345678,B ;set CCR bits for value in A, update BBefore ExecutionAI~--------------~$01 :020304:000000 A~I ____After Execution$0_1_:02_0_30_4:_00_00_00 __ ~CCR 1-1__________ $0_3_00 __----'CCRI~ __________ $0_33_0 __ ~Explanation of Example: Prior to execution, the 56-bit A accumulator contains thevalue $01 :020304:000000, and the 16-bit condition code register contains the value$0300. The execution of the TST A instruction compares the value in the A register withzero and updates the condition code register accordingly. The contents of the A accumulatorare not affected.Condition Codes:15 14 13 12 11 -10 9 8 7 6 5 4 3 2 0I LF I OM I T I ** I 81 I 80 I 11 I 10 I 8 I LIE I U N I z I v I : I.... MR ....... CCR _.-S -L -E -U -N -Z -V -Computed according to the definition in A.5 CONDITION CODE COMPUTATIONSet if data limiting has occurred during parallel moveSet if the signed integer portion of A or B result is in useSet if A or B result is unnormalizedSet if bit 55 of A or B result is setSet if A or B result equals zeroAlways clearedNote: The definitions of the E and U bits vary according to the scaling mode being used.Refer to Section A.5 CONDITION CODE COMPUTATION for complete details.