Question

.Assume: We are using a CPU12 as a coffee maker controller. An ADC provides the temperature of the water in °C at memory location $0067. Writing $01 to memory location $0068 turns the coffee maker heating element on. Writing $00 to memory location $0068 turns the heating element off. Write an assembly-language program that loops continually and: Turns the heating element on when the temperature falls below 90 °C Turns the heating element off when the temperature reaches 100 °C

Answer 1

Answer :- The CPU12 assembly code can be written as-

Loop_Main : ; label named as Loop_Main

LDAA $0067 ; register A = temperature value from ADC

LDAB #$5A ; register B = 0x5A = 90

CBA ; compare A and B register value

BLT Make_ON ; if temperature less than 90⁰, goto label named as Make_ON

LDAB #$64 ; register B = 0x64 = 100

CBA ; compare A and B register value

BGE Make_OFF ; if temperature greater than equal to100⁰, goto label named as Make_OFF

JMP Loop_Main ; do infinite looping of this code

Make_ON : ; label named as Make_ON

LDAA #$01 ; register A = 0x01

STAA $0068 ; write the value in memory location 0x0068 to make machine ON

JMP Loop_main ; go to label named as Loop_main

Make_OFF : ; label named as Make_OFF

LDAA #$00 ; register A = 0x00

STAA $0068 ; write the value in memory location 0x0068 to make machine OFF

JMP Loop_main ; go to label named as Loop_main