In the HCS12 There are eight switches connected to PORTD and

In the HCS12 There are eight switches connected to PORTD and eight LEDs connected to PORTA. Write a program to monitor the switches continuously. Whenever the value of the switches becomes less than or equal to $65, turn all of the LEDs on. (Points : 5)

Solution

LDAA #$00

STAA DDRC

LDAA #$FF

STAA DDRB

THERE LDAA PORTD

CMPA #$65

BLS THERE

LDAA #$FF

STAA PORTA

BRA THERE