Write instruction to configure PORTE bit $1,2$ and $6$ as inputs and PORTE bit $0,$

$3,4,5$ and $7$ as outputs. $[2$ marks$]$

$($b$)$ Which registers are involved in the configuration of bidirectional input$/$output pin

for PORTA and PORTC? $[1$ mark$]$

$($c$)$ Write an instruction sequence to configure INT$1$ as low priority interrupt and INT$3$

as high priority interrupt. $[5$ marks$]$

$($d$)$ Write instruction sequence to monitor bit $2$ and bit $3$ at PORTC. When both bit

are HIGH, toggle odd bit at PORTF. When both bit are LOW, complement the

PORTD. Otherwise, when one bit HIGH and one bit LOW, send value $0$xFF to

both port; PORTF and PORTD.