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Decisions in assembler code

Decisions in assembler code. 3 < A < 8. Flowchart and assembler LDAA VALA CMPA #3 BLE OUT CMPA #8 BGE OUT Do action OUT continuation. A<2 or A>=6. Flowchart and assembler LDAA vala CMPA #2 BLT act CMPA #6

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Decisions in assembler code

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  1. Decisions in assembler code

  2. 3 < A < 8 • Flowchart and assembler • LDAA VALA • CMPA #3 • BLE OUT • CMPA #8 • BGE OUT • Do action OUT continuation

  3. A<2 or A>=6 • Flowchart and assembler • LDAA vala • CMPA #2 • BLT act • CMPA #6 • BGE out • act action for True • out continuation

  4. 2<=A<=5 • Flowchart and assembler • LDAA vala • CMPA #2 • BLT out • CMPA #5 • BGT out • action when true • out continuation

  5. Simulation Assignment 1 • Enter the following code into THRSIM • ORG $50 • INNR RMB 1 • OTTR RMB 1 • ORG $E000 • LDAB #$FF • STAB $1007 configure port C for output • OL LDAA delayval try 1, try 10, etc • STAA ottr • TOP DECR INNR • BNE TOP • DEC OTTR • BNE TOP • EORB #$FF • STAB $1003 • BRA OL • LDA $FF • END BRA END

  6. SimAsg 1 (cont) • Before running your code configure an LED on pin PC 0. To do this go to the connect window, choose LED. When the popup comes up scroll in the left side and select PC0. Then hit connect. Then say OK. • After entering the code run your code, using different values for DELAYVAL • Note the difference in the time it takes from when you click on RUN until accumulator A becomes FF. • Try the program with delay val of 1 and delay val of $F0. • Change the value until you achieve approximately 1 second.

  7. Being able to reset simulator • If you want to be able to reset the simulator to rerun you code enter the following. • ORG $FFFE • FCB $E0 • FCB $00 • What does this do? It resets the PC when a reset occurs to value $E000

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